# IsCollisionEnter

> Whether or not this pair is equivalent to a pair reported in MonoBehaviour.OnCollisionEnter(Collision) events.

## Definition

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

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

```csharp
public bool IsCollisionEnter { get; }
```