diff --git a/core/modules/breakpoint/breakpoint.module b/core/modules/breakpoint/breakpoint.module
index a2450f9..63a6bac 100644
--- a/core/modules/breakpoint/breakpoint.module
+++ b/core/modules/breakpoint/breakpoint.module
@@ -100,7 +100,7 @@ function _breakpoint_delete_breakpoints($list, $source_type) {
 
       // Make sure we only delete breakpoints defined by this theme/module.
       foreach ($breakpoints as $breakpoint) {
-        if ($breakpoint->sourceType == $source_type && $breakpoint->source == $breakpoint_group->name) {
+        if ($breakpoint->getSourceType() == $source_type && $breakpoint->getSource() == $breakpoint_group->name) {
           $breakpoint->delete();
         }
       }
@@ -174,7 +174,7 @@ function breakpoint_select_options() {
   $options = array();
   $breakpoints = entity_load_multiple('breakpoint');
   foreach ($breakpoints as $breakpoint) {
-    $options[$breakpoint->id()] = $breakpoint->label() . ' (' . $breakpoint->source . ' - ' . $breakpoint->sourceType . ') [' . $breakpoint->mediaQuery . ']';
+    $options[$breakpoint->id()] = $breakpoint->getLabel() . ' (' . $breakpoint->getSource() . ' - ' . $breakpoint->getSourceType() . ') [' . $breakpoint->getMediaQuery() . ']';
   }
   asort($options);
   return $options;
diff --git a/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointInterface.php b/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointInterface.php
index cf62bcd..4f4e4fc 100644
--- a/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointInterface.php
+++ b/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointInterface.php
@@ -40,4 +40,109 @@ public function isValid();
    */
   public static function isValidMediaQuery($media_query);
 
+  /**
+   * @param string
+   *   The name of the breakpoint.
+   *
+   * @return \Drupal\breakpoint\BreakpointInterface
+   *  The modified breakpoint
+   */
+  public function setName($name);
+
+  /**
+   * @return string
+   *   The name of the breakpoint.
+   */
+  public function getName();
+
+  /**
+   * @param string $label
+   *   The label the breakpoint will use.
+   *
+   * @return \Drupal\breakpoint\BreakpointInterface
+   *  The modified breakpoint
+   */
+  public function setLabel($label);
+
+  /**
+   * @return string
+   *   The breakpoint's label.
+   */
+  public function getLabel();
+
+  /**
+   * @param string $mediaQuery
+   *   The media query the breakpoint will use.
+   *
+   * @return \Drupal\breakpoint\BreakpointInterface
+   *  The modified breakpoint
+   */
+  public function setMediaQuery($mediaQuery);
+
+  /**
+   * @return string
+   *   The breakpoint's media query.
+   */
+  public function getMediaQuery();
+
+  /**
+   * @param string $source
+   *   The source the breakpoint will use.
+   *
+   * @return \Drupal\breakpoint\BreakpointInterface
+   *  The modified breakpoint
+   */
+  public function setSource($source);
+
+  /**
+   * @return string
+   *   The breakpoint's source.
+   */
+  public function getSource();
+
+  /**
+   * @param string $sourceType
+   *   The source type the breakpoint will use.
+   *
+   * @return \Drupal\breakpoint\BreakpointInterface
+   *  The modified breakpoint
+   */
+  public function setSourceType($sourceType);
+
+  /**
+   * @return string
+   *   The breakpoint's source type.
+   */
+  public function getSourceType();
+
+  /**
+   * @param integer $weight
+   *   The weight the breakpoint will be set with.
+   *
+   * @return \Drupal\breakpoint\BreakpointInterface
+   *  The modified breakpoint
+   */
+  public function setWeight($weight);
+
+  /**
+   * @return integer
+   *   The breakpoint's weight.
+   */
+  public function getWeight();
+
+  /**
+   * @param array $multipliers
+   *   An array of multipliers.
+   *
+   * @return \Drupal\breakpoint\BreakpointInterface
+   *  The modified breakpoint
+   */
+  public function setMultipliers($multipliers);
+
+  /**
+   * @return array
+   *   The breakpoint's multipliers.
+   */
+  public function getMultipliers();
+
 }
diff --git a/core/modules/breakpoint/lib/Drupal/breakpoint/Entity/Breakpoint.php b/core/modules/breakpoint/lib/Drupal/breakpoint/Entity/Breakpoint.php
index 0736131..b2d95dd 100644
--- a/core/modules/breakpoint/lib/Drupal/breakpoint/Entity/Breakpoint.php
+++ b/core/modules/breakpoint/lib/Drupal/breakpoint/Entity/Breakpoint.php
@@ -23,6 +23,7 @@
  * @EntityType(
  *   id = "breakpoint",
  *   label = @Translation("Breakpoint"),
+ *   module = "breakpoint",
  *   controllers = {
  *     "storage" = "Drupal\Core\Config\Entity\ConfigStorageController"
  *   },
@@ -130,22 +131,22 @@ public function save() {
     // Build an id if none is set.
     // Since a particular name can be used by multiple theme/modules we need
     // to make a unique id.
-    if (empty($this->id)) {
-      $this->id = $this->sourceType . '.' . $this->source . '.' . $this->name;
+    if (!$this->id()) {
+      $this->id = ($this->getSourceType() . '.' . $this->getSource() . '.' . $this->getName());
     }
 
     // Set the label if none is set.
-    if (empty($this->label)) {
-      $this->label = $this->name;
+    if (!$this->getLabel()) {
+      $this->setLabel($this->getName());
     }
 
     // Remove unused multipliers.
-    $this->multipliers = array_filter($this->multipliers);
+    $this->setMultipliers(array_filter($this->getMultipliers()));
 
     // Always add '1x' multiplier, use array_key_exists since the value might
     // be NULL.
-    if (!array_key_exists('1x', $this->multipliers)) {
-      $this->multipliers = array('1x' => '1x') + $this->multipliers;
+    if (!array_key_exists('1x', $this->getMultipliers())) {
+      $this->setMultipliers(array('1x' => '1x') + $this->getMultipliers());
     }
     return parent::save();
   }
@@ -155,24 +156,24 @@ public function save() {
    */
   public function isValid() {
     // Check for illegal values in breakpoint source type.
-    if (!in_array($this->sourceType, array(
+    if (!in_array($this->getSourceType(), array(
         Breakpoint::SOURCE_TYPE_USER_DEFINED,
         Breakpoint::SOURCE_TYPE_MODULE,
         Breakpoint::SOURCE_TYPE_THEME)
       )) {
       throw new InvalidBreakpointSourceTypeException(format_string('Invalid source type @source_type', array(
-        '@source_type' => $this->sourceType,
+        '@source_type' => $this->getSourceType(),
       )));
     }
     // Check for illegal characters in breakpoint source.
-    if (preg_match('/[^0-9a-z_]+/', $this->source)) {
-      throw new InvalidBreakpointSourceException(format_string("Invalid value '@source' for breakpoint source property. Breakpoint source property can only contain lowercase alphanumeric characters and underscores.", array('@source' => $this->source)));
+    if (preg_match('/[^0-9a-z_]+/', $this->getSource())) {
+      throw new InvalidBreakpointSourceException(format_string("Invalid value '@source' for breakpoint source property. Breakpoint source property can only contain lowercase alphanumeric characters and underscores.", array('@source' => $this->getSource())));
     }
     // Check for illegal characters in breakpoint names.
-    if (preg_match('/[^0-9a-z_\-]/', $this->name)) {
-      throw new InvalidBreakpointNameException(format_string("Invalid value '@name' for breakpoint name property. Breakpoint name property can only contain lowercase alphanumeric characters, underscores (_), and hyphens (-).", array('@name' => $this->name)));
+    if (preg_match('/[^0-9a-z_\-]/', $this->getName())) {
+      throw new InvalidBreakpointNameException(format_string("Invalid value '@name' for breakpoint name property. Breakpoint name property can only contain lowercase alphanumeric characters, underscores (_), and hyphens (-).", array('@name' => $this->getName())));
     }
-    return $this::isValidMediaQuery($this->mediaQuery);
+    return $this::isValidMediaQuery($this->getMediaQuery());
   }
 
   /**
@@ -182,17 +183,37 @@ public static function isValidMediaQuery($media_query) {
     // Array describing all known media features and the expected value type or
     // an array containing the allowed values.
     $media_features = array(
-      'width' => 'length', 'min-width' => 'length', 'max-width' => 'length',
-      'height' => 'length', 'min-height' => 'length', 'max-height' => 'length',
-      'device-width' => 'length', 'min-device-width' => 'length', 'max-device-width' => 'length',
-      'device-height' => 'length', 'min-device-height' => 'length', 'max-device-height' => 'length',
+      'width' => 'length',
+      'min-width' => 'length',
+      'max-width' => 'length',
+      'height' => 'length',
+      'min-height' => 'length',
+      'max-height' => 'length',
+      'device-width' => 'length',
+      'min-device-width' => 'length',
+      'max-device-width' => 'length',
+      'device-height' => 'length',
+      'min-device-height' => 'length',
+      'max-device-height' => 'length',
       'orientation' => array('portrait', 'landscape'),
-      'aspect-ratio' => 'ratio', 'min-aspect-ratio' => 'ratio', 'max-aspect-ratio' => 'ratio',
-      'device-aspect-ratio' => 'ratio', 'min-device-aspect-ratio' => 'ratio', 'max-device-aspect-ratio' => 'ratio',
-      'color' => 'integer', 'min-color' => 'integer', 'max-color' => 'integer',
-      'color-index' => 'integer', 'min-color-index' => 'integer', 'max-color-index' => 'integer',
-      'monochrome' => 'integer', 'min-monochrome' => 'integer', 'max-monochrome' => 'integer',
-      'resolution' => 'resolution', 'min-resolution' => 'resolution', 'max-resolution' => 'resolution',
+      'aspect-ratio' => 'ratio',
+      'min-aspect-ratio' => 'ratio',
+      'max-aspect-ratio' => 'ratio',
+      'device-aspect-ratio' => 'ratio',
+      'min-device-aspect-ratio' => 'ratio',
+      'max-device-aspect-ratio' => 'ratio',
+      'color' => 'integer',
+      'min-color' => 'integer',
+      'max-color' => 'integer',
+      'color-index' => 'integer',
+      'min-color-index' => 'integer',
+      'max-color-index' => 'integer',
+      'monochrome' => 'integer',
+      'min-monochrome' => 'integer',
+      'max-monochrome' => 'integer',
+      'resolution' => 'resolution',
+      'min-resolution' => 'resolution',
+      'max-resolution' => 'resolution',
       'scan' => array('progressive', 'interlace'),
       'grid' => 'integer',
     );
@@ -283,4 +304,132 @@ public static function isValidMediaQuery($media_query) {
     }
     throw new InvalidBreakpointMediaQueryException('Media query is empty.');
   }
+
+  /**
+   * Overrides \Drupal\Core\Config\Entity\ConfigEntityBase::getExportProperties();
+   */
+  public function getExportProperties() {
+    $names = array(
+      'id',
+      'uuid',
+      'name',
+      'label',
+      'mediaQuery',
+      'source',
+      'sourceType',
+      'weight',
+      'multipliers',
+    );
+    $properties = array();
+    foreach ($names as $name) {
+      $properties[$name] = $this->get($name);
+    }
+    return $properties;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setName($name) {
+    $this->set('name', $name);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getName() {
+    return $this->get('name');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setLabel($label) {
+    $this->set('label', $label);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getLabel() {
+    return $this->get('label');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setMediaQuery($mediaQuery) {
+    $this->set('mediaQuery', $mediaQuery);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getMediaQuery() {
+    return $this->get('mediaQuery');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setSource($source) {
+    $this->set('source', $source);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getSource() {
+    return $this->get('source');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setSourceType($sourceType) {
+    $this->set('sourceType', $sourceType);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getSourceType() {
+    return $this->get('sourceType');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setWeight($weight) {
+    $this->set('weight', $weight);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getWeight() {
+    return $this->get('weight');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setMultipliers($multipliers) {
+    $this->set('multipliers', $multipliers);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getMultipliers() {
+    return $this->get('multipliers');
+  }
+
 }
diff --git a/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointAPITest.php b/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointAPITest.php
index 85d0711..5135797 100644
--- a/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointAPITest.php
+++ b/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointAPITest.php
@@ -46,9 +46,9 @@ public function testConfigName() {
     $this->assertTrue($exception, 'breakpoint_config_name: An exception is thrown when an invalid sourceType is entered.');
 
     // Try an invalid source.
-    $breakpoint->id = '';
-    $breakpoint->sourceType = Breakpoint::SOURCE_TYPE_USER_DEFINED;
-    $breakpoint->source = 'custom*_module source';
+    $breakpoint->enforceIsNew();
+    $breakpoint->setSourceType(Breakpoint::SOURCE_TYPE_USER_DEFINED)
+      ->setSource('custom*_module source');
 
     $exception = FALSE;
     try {
@@ -60,9 +60,9 @@ public function testConfigName() {
     $this->assertTrue($exception, 'breakpoint_config_name: An exception is thrown when an invalid source is entered.');
 
     // Try an invalid name (make sure there is at least once capital letter).
-    $breakpoint->id = '';
-    $breakpoint->source = 'custom_module';
-    $breakpoint->name = drupal_ucfirst($this->randomName());
+    $breakpoint->enforceIsNew();
+    $breakpoint->setSource('custom_module')
+      ->setName(drupal_ucfirst($this->randomName()));
 
     $exception = FALSE;
     try {
@@ -74,9 +74,9 @@ public function testConfigName() {
     $this->assertTrue($exception, 'breakpoint_config_name: An exception is thrown when an invalid name is entered.');
 
     // Try a valid breakpoint.
-    $breakpoint->id = '';
-    $breakpoint->name = drupal_strtolower($this->randomName());
-    $breakpoint->mediaQuery = 'all';
+    $breakpoint->enforceIsNew();
+    $breakpoint->setName(drupal_strtolower($this->randomName()))
+      ->setMediaQuery('all');
 
     $exception = FALSE;
     try {
@@ -86,6 +86,6 @@ public function testConfigName() {
       $exception = TRUE;
     }
     $this->assertFalse($exception, 'breakpoint_config_name: No exception is thrown when a valid breakpoint is passed.');
-    $this->assertEqual($breakpoint->id(), Breakpoint::SOURCE_TYPE_USER_DEFINED . '.custom_module.' . $breakpoint->name, 'breakpoint_config_name: A id is set when a valid breakpoint is passed.');
+    $this->assertEqual($breakpoint->id(), Breakpoint::SOURCE_TYPE_USER_DEFINED . '.custom_module.' . $breakpoint->getName(), 'breakpoint_config_name: A id is set when a valid breakpoint is passed.');
   }
 }
diff --git a/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointCRUDTest.php b/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointCRUDTest.php
index 4358869..ceef678 100644
--- a/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointCRUDTest.php
+++ b/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointCRUDTest.php
@@ -42,8 +42,8 @@ public function testBreakpointCRUD() {
     $this->verifyBreakpoint($breakpoint, $all_breakpoints[$config_name]);
 
     // Update the breakpoint.
-    $breakpoint->weight = 1;
-    $breakpoint->multipliers['2x'] = '2x';
+    $breakpoint->setWeight(1)
+      ->setMultipliers(array('2x' => '2x'));
     $breakpoint->save();
     $this->verifyBreakpoint($breakpoint);
 
diff --git a/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointTestBase.php b/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointTestBase.php
index 89d0cc1..4b59d3b 100644
--- a/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointTestBase.php
+++ b/core/modules/breakpoint/lib/Drupal/breakpoint/Tests/BreakpointTestBase.php
@@ -30,22 +30,22 @@ public function setUp() {
    */
   public function verifyBreakpoint(Breakpoint $breakpoint, Breakpoint $compare_breakpoint = NULL) {
     $properties = array(
-      'label',
-      'mediaQuery',
-      'source',
-      'sourceType',
-      'weight',
-      'multipliers',
+      'Label',
+      'MediaQuery',
+      'Source',
+      'SourceType',
+      'Weight',
+      'Multipliers',
     );
 
     // Verify breakpoint_load().
     $compare_breakpoint = is_null($compare_breakpoint) ? breakpoint_load($breakpoint->id()) : $compare_breakpoint;
     foreach ($properties as $property) {
       $t_args = array(
-        '%breakpoint' => $breakpoint->label(),
+        '%breakpoint' => $breakpoint->getLabel(),
         '%property' => $property,
       );
-      $this->assertEqual($compare_breakpoint->{$property}, $breakpoint->{$property}, format_string('breakpoint_load: Proper %property for breakpoint %breakpoint.', $t_args), 'Breakpoint API');
+      $this->assertEqual($compare_breakpoint->{'get' . $property}(), $breakpoint->{'get' . $property}(), format_string('breakpoint_load: Proper %property for breakpoint %breakpoint.', $t_args), 'Breakpoint API');
     }
   }
 }
diff --git a/core/modules/picture/lib/Drupal/picture/Entity/PictureMapping.php b/core/modules/picture/lib/Drupal/picture/Entity/PictureMapping.php
index e6ce436..c8390bf 100644
--- a/core/modules/picture/lib/Drupal/picture/Entity/PictureMapping.php
+++ b/core/modules/picture/lib/Drupal/picture/Entity/PictureMapping.php
@@ -136,8 +136,8 @@ protected function loadAllMappings() {
         }
 
         // Get the mapping for the other multipliers.
-        if (isset($breakpoint->multipliers) && !empty($breakpoint->multipliers)) {
-          foreach ($breakpoint->multipliers as $multiplier => $status) {
+        if ($breakpoint->getMultipliers()) {
+          foreach ($breakpoint->getMultipliers() as $multiplier => $status) {
             if ($status) {
               $this->mappings[$breakpoint_id][$multiplier] = '';
               if (isset($loaded_mappings[$breakpoint_id][$multiplier])) {
diff --git a/core/modules/picture/lib/Drupal/picture/PictureMappingFormController.php b/core/modules/picture/lib/Drupal/picture/PictureMappingFormController.php
index 121f6a7..53c11dd 100644
--- a/core/modules/picture/lib/Drupal/picture/PictureMappingFormController.php
+++ b/core/modules/picture/lib/Drupal/picture/PictureMappingFormController.php
@@ -74,7 +74,7 @@ public function form(array $form, array &$form_state) {
     foreach ($picture_mapping->mappings as $breakpoint_id => $mapping) {
       foreach ($mapping as $multiplier => $image_style) {
         $breakpoint = $picture_mapping->breakpointGroup->getBreakpointById($breakpoint_id);
-        $label = $multiplier . ' ' . $breakpoint->name . ' [' . $breakpoint->mediaQuery . ']';
+        $label = $multiplier . ' ' . $breakpoint->getName() . ' [' . $breakpoint->getMediaQuery() . ']';
         $form['mappings'][$breakpoint_id][$multiplier] = array(
           '#type' => 'select',
           '#title' => check_plain($label),
diff --git a/core/modules/picture/lib/Drupal/picture/Plugin/Field/FieldFormatter/PictureFormatter.php b/core/modules/picture/lib/Drupal/picture/Plugin/Field/FieldFormatter/PictureFormatter.php
index a28e5fb..2e033cc 100644
--- a/core/modules/picture/lib/Drupal/picture/Plugin/Field/FieldFormatter/PictureFormatter.php
+++ b/core/modules/picture/lib/Drupal/picture/Plugin/Field/FieldFormatter/PictureFormatter.php
@@ -136,7 +136,7 @@ public function viewElements(FieldItemListInterface $items) {
           $breakpoint = $picture_mapping->breakpointGroup->getBreakpointById($breakpoint_name);
           if ($breakpoint) {
             // Determine the enabled multipliers.
-            $multipliers = array_intersect_key($multipliers, $breakpoint->multipliers);
+            $multipliers = array_intersect_key($multipliers, $breakpoint->getMultipliers());
             foreach ($multipliers as $multiplier => $image_style) {
               // Make sure the multiplier still exists.
               if (!empty($image_style)) {
diff --git a/core/modules/picture/picture.module b/core/modules/picture/picture.module
index b9b3b01..05e53bb 100644
--- a/core/modules/picture/picture.module
+++ b/core/modules/picture/picture.module
@@ -254,7 +254,7 @@ function theme_picture($variables) {
         $sources[] = array(
           'src' => entity_load('image_style', $new_sources[0]['style_name'])->buildUrl($new_sources[0]['uri']),
           'dimensions' => picture_get_image_dimensions($new_sources[0]),
-          'media' => $breakpoint->mediaQuery,
+          'media' => $breakpoint->getMediaQuery(),
         );
       }
       else {
@@ -266,7 +266,7 @@ function theme_picture($variables) {
         $sources[] = array(
           'srcset' => implode(', ', $srcset),
           'dimensions' => picture_get_image_dimensions($new_sources[0]),
-          'media' => $breakpoint->mediaQuery,
+          'media' => $breakpoint->getMediaQuery(),
         );
       }
     }
diff --git a/core/modules/toolbar/toolbar.module b/core/modules/toolbar/toolbar.module
index b8b0dcb..1d109c9 100644
--- a/core/modules/toolbar/toolbar.module
+++ b/core/modules/toolbar/toolbar.module
@@ -185,14 +185,14 @@ function toolbar_pre_render($element) {
 
   // Get the configured breakpoints to switch from vertical to horizontal
   // toolbar presentation.
-  $breakpoints = entity_load('breakpoint_group', 'module.toolbar.toolbar');
-  if (!empty($breakpoints)) {
+  $breakpoint_group = entity_load('breakpoint_group', 'module.toolbar.toolbar');
+  if (!empty($breakpoint_group)) {
     $media_queries = array();
     $media_queries['toolbar']['breakpoints'] = array_map(
       function ($object) {
-        return $object->mediaQuery;
+        return $object->getMediaQuery();
       },
-      $breakpoints->getBreakpoints()
+      $breakpoint_group->getBreakpoints()
     );
 
     $element['#attached']['js'][] = array(