1.The upgrade parts are made of aluminum by CNC 3D processed, by adopting whole shaped technology, the products have the characteristic of high intensity and durability. 2. The Aluminum Exterior Lock Rings only fit the Losi Super BAJA REY 2.0 1/6 stock wheels, and also fit the Aluminum wheels of E-VIRATRUE. 3. The lock rings come with stainless steel screws.