# Circle Collider 2D component reference

> Refer to the Circle Collider 2D component properties to create circular colliders.

The Circle Collider 2D component is a [Collider 2D](/engine/6000.5/manual/unity2d/2d-physics/collider-2d.md) that interacts with the 2D physics system for collision detection. This collider is circular in shape, with a defined position and radius within the local coordinate space of a sprite. Adjust the component properties to change the shape and behavior of the collider.

| **Property**                    | **Function**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| ------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Material**                    | Select the [Physics Material 2D](/engine/6000.5/manual/unity2d/2d-physics/physics-material-2d-reference.md) that determines properties of collisions, such as friction and bounce.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| **Is Trigger**                  | Enable this if you want the collider to behave as a trigger. The physics system ignores the collider when you enable this option.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| **Used By Effector**            | Enable this if you want an attached Effector 2D component to use the collider.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| **Composite Operation**         | If a [Composite Collider 2D](/engine/6000.5/manual/unity2d/2d-physics/collider-2d/composite-collider-2d/reference.md) component is attached to the same GameObject, sets how the component combines the collision shapes. The options are:**None**: Doesn't combine the collision shapes.**Merge**: Combines the collision shapes.**Intersect**: Creates a collision shape from the overlapping area of the collision shapes.**Difference**: Creates a collision shape from the non-overlapping area of the collision shapes.**Flip**: Creates a collision shape from the non-overlapping area of the collision shapes, but also includes the area outside the collision shapes.**Note**: When you set the value to an option other than **None**, the Composite Collider 2D component controls the following properties: **Material**, **Is Trigger**, and **Used By Effector**. |
| **Offset**                      | Set the local offset values of the Collider 2D geometry.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| **Radius**                      | Set the radius of the Circle Collider 2D in local space units.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| **Layer Overrides**             | Expand for the layer override settings.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|     **Layer Override Priority** | Sets the decision priority when this collision shape collides with another collision shape. Refer to its [API](/engine/6000.5/script-reference/unityengine/collider2d/layeroverridepriority.md) documentation for more information.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|     **Include Layers**          | Sets the layers this collision shape collides with. Refer to [`Collider2D-includeLayers`](/engine/6000.5/script-reference/unityengine/collider2d/includelayers.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|     **Exclude Layers**          | Sets the layers this collision shape doesn't collide with. Refer to [`Collider2D-excludeLayers`](/engine/6000.5/script-reference/unityengine/collider2d/excludelayers.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|     **Force Send Layers**       | Sets the layers this collision shape sends forces to during collisions. Refer to [`Collider2D-forceSendLayers`](/engine/6000.5/script-reference/unityengine/collider2d/forcesendlayers.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|     **Force Receive Layers**    | Sets the layers this collision shape can receive forces from during collisions. Refer to [`Collider2D-forceReceiveLayers`](/engine/6000.5/script-reference/unityengine/collider2d/forcereceivelayers.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|     **Contact Capture Layers**  | Sets the layers of other Collider 2D components to capture during collisions. Refer to [`Collider2D-contactCaptureLayers`](/engine/6000.5/script-reference/unityengine/collider2d/contactcapturelayers.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|     **Callback Layers**         | Sets the layers to report collisions or triggers with. Refer to [`Collider2D-callbackLayers`](/engine/6000.5/script-reference/unityengine/collider2d/callbacklayers.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |

## Additional resources

* [Collider 2D API documentation](/engine/6000.5/script-reference/unityengine/collider2d.md)
* [Rigidbody 2D](/engine/6000.5/manual/unity2d/2d-physics/rigidbody-2d.md)