diff --git a/src/main/java/org/spongepowered/api/data/Keys.java b/src/main/java/org/spongepowered/api/data/Keys.java
index 082513bc91..691f5a002c 100644
--- a/src/main/java/org/spongepowered/api/data/Keys.java
+++ b/src/main/java/org/spongepowered/api/data/Keys.java
@@ -572,6 +572,24 @@ public final class Keys {
      */
     public static final Key<Value<BossBar>> BOSS_BAR = Keys.key(ResourceKey.sponge("boss_bar"), BossBar.class);
 
+    /**
+     * The width of the interactable form of an {@link Entity}.
+     *
+     * <p>Together with {@link #BOUNDING_BOX_HEIGHT} this defines
+     * the size of the {@link Entity}'s bounding box.</p>
+     * Readonly(Entity.class) expect Interaction
+     */
+    public static final Key<Value<Double>> BOUNDING_BOX_BASE_SIZE = Keys.key(ResourceKey.sponge("bounding_box_base_size"), Double.class);
+
+    /**
+     * The height of the interactable form of an {@link Entity}.
+     *
+     * <p>Together with {@link #BOUNDING_BOX_BASE_SIZE} this defines
+     * the size of the {@link Entity}'s bounding box.</p>
+     * Readonly(Entity.class) expect Interaction
+     */
+    public static final Key<Value<Double>> BOUNDING_BOX_HEIGHT = Keys.key(ResourceKey.sponge("bounding_box_height"), Double.class);
+
     /**
      * The {@link BlockType}s able to be broken by an {@link ItemStack}.
      */
diff --git a/src/main/java/org/spongepowered/api/entity/Entity.java b/src/main/java/org/spongepowered/api/entity/Entity.java
index 2f39680f34..668f17c401 100644
--- a/src/main/java/org/spongepowered/api/entity/Entity.java
+++ b/src/main/java/org/spongepowered/api/entity/Entity.java
@@ -655,4 +655,22 @@ default Optional<Value.Mutable<Double>> swiftness() {
 
     @Override
     HoverEvent<HoverEvent.ShowEntity> asHoverEvent(final UnaryOperator<HoverEvent.ShowEntity> op);
+
+    /**
+     * {@link Keys#BOUNDING_BOX_BASE_SIZE}
+     *
+     * @return The bounding box base size of the entity
+     */
+    default Value.Mutable<Double> boundingBoxBaseSize() {
+        return this.requireValue(Keys.BOUNDING_BOX_BASE_SIZE).asMutable();
+    }
+
+    /**
+     * {@link Keys#BOUNDING_BOX_HEIGHT}
+     *
+     * @return The bounding box height of the entity
+     */
+    default Value.Mutable<Double> boundingBoxHeight() {
+        return this.requireValue(Keys.BOUNDING_BOX_HEIGHT).asMutable();
+    }
 }