# bodyInstanceID

> Instance ID of the first body in this contact pair.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.3/script-reference/unityengine.md)
* **Assembly:** UnityEngine.PhysicsModule

```csharp
public int bodyInstanceID { get; }
```

### Remarks

Note that this can be Rigidbody or ArticulationBody.