# Sandbox.PhysicsBody.SurfaceMaterial

```csharp
string SurfaceMaterial { get; set; }
```

Sets [Sandbox.PhysicsShape.SurfaceMaterial](/api/Sandbox.PhysicsShape/SurfaceMaterial) on all child [PhysicsShape](/api/Sandbox.PhysicsShape)s.

Declared in [Sandbox.PhysicsBody](/api/Sandbox.PhysicsBody).
Assembly: `Sandbox.Engine`.