# ColliderInstanceID

> Instance ID of the first Collider in the ContactPair.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.5/script-reference/unityengine.md)
* **Assembly:** UnityEngine.PhysicsModule

> **Warning:**
>
> **Deprecated.** Please use ContactPair.colliderInstanceID instead.
>
> **Upgrade to** [ContactPair.colliderInstanceID](/engine/6000.5/script-reference/unityengine/contactpair/colliderinstanceid-1.md)

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