This is an optional Traxxas 17mm Splined Wheel Hub Set, and is intended for use with the Traxxas Revo. These Traxxas 17mm hubs and wheel nuts are made from durable 6061-T6 aluminum, feature an innovative splined design, and are anodized in a brilliant red 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. This package includes four hubs, four nuts and four set screws.