# surfaceMaterial

> The surface material for the shape comprising of many properties such as friction, bounciness, rolling resistance etc.

## Definition

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

```csharp
public PhysicsShape.SurfaceMaterial surfaceMaterial
```

### Remarks

This is exposed directly as a field rather than a property as it is extremely unlikely to ever change and causes usability issues as a property.