Collider.material

Description

Материал, используемый коллайдером.

If material is shared by colliders, it will duplicate the material and assign it to the collider.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public float dynFriction;
    public float statFriction;
    public Collider coll;
    void Start() {
        coll = GetComponent<Collider>();
        coll.material.dynamicFriction = dynFriction;
        coll.material.staticFriction = statFriction;
    }
}