Traxxas aluminum stub axle carriers improve the appearance and ruggedness of your Traxxas model. The machined billet 6061-T6 aluminum construction adds superior strength with a brilliant anodized finish. Larger 5x11 mm ball bearings are included for smooth performance, reduced friction, and long life. Rubber seals on the bearings make them virtually maintenance free. Traxxas high-performance accessories are made by Traxxas, for Traxxas, so installation is always straight-forward and hassle-free.