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 Inner & Exterior Lock Rings only fit Losi Super BAJA REY 2.0 1/6 stock tires and wheels, and they also fit the Aluminum wheels of E-VIRATRUE. 3. The lock rings come with stainless steel screws.