diff --git a/Game/Physics2D/Abstract/IPhysicsMaterial2D.cs b/Game/Physics2D/Abstract/IPhysicsMaterial2D.cs
index 266545d..c533cda 100644
--- a/Game/Physics2D/Abstract/IPhysicsMaterial2D.cs
+++ b/Game/Physics2D/Abstract/IPhysicsMaterial2D.cs
@@ -2,6 +2,6 @@ namespace Syntriax.Engine.Physics2D.Abstract;
 
 public interface IPhysicsMaterial2D
 {
-    float Friction { get; set; }
-    float Restitution { get; set; }
+    float Friction { get; }
+    float Restitution { get; }
 }