This is an optional Traxxas 17mm Splined Wheel Hub Set, and is intended for use with the Traxxas Revo. Traxxas 17mm hubs and wheel nuts are made from durable 6061-T6 aluminum, feature an innovative splined design, and are anodized in a brilliant green finish. For precision alignment and unsurpassed torque handling, the splined design interlocks with Traxxas 17mm splined wheels. The ground-breaking design also accepts wheels with traditional aftermarket 17mm hex hubs.