# callbackTarget

> Get/Set the Object that event callbacks for this joint will be sent to. Care should be taken with any Object assigned as a callback target that isn't a Object as this assignment will not in itself keep the object alive and can be garbage collected. To avoid this, you should have at least a single reference to the object in your code. To remove the object assigned here, set the callback target to NULL. This includes the following events: A PhysicsEvents.JointThresholdEvent with call PhysicsCallbacks.IJointThresholdCallback.

## Definition

* **Type:** Property
* **Namespace:** [Unity.U2D.Physics](/engine/6000.5/script-reference/unity/u2d/physics.md)
* **Assembly:** UnityEngine.PhysicsCore2DModule

```csharp
public object callbackTarget { get; set; }
```