# BodyInstanceID

> Instance ID of the first Rigidbody or the ArticualtionBody in the pair.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.PhysicsModule

> **Warning:**
>
> **Deprecated.** Please use ContactPairHeader.bodyInstanceID instead.
>
> **Upgrade to** [ContactPairHeader.bodyInstanceID](/engine/6000.0/script-reference/unityengine/contactpairheader/bodyinstanceid-1.md)

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