The Traxxas #6878 is a pre-assembled slipper clutch assembly for Traxxas 1/10 4x4 vehicles: Telluride, Rally, Slash 4x4, and Stampede 4x4. The clutch assembly comes with a 54-T, 32P spur gear pre-installed. Optional part #6893X can be used for high-power or heavy abuse applications. Use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles. This product is made from high quality materials and designed for long-lasting performance. This is replacement hardware for use on Traxxas vehicles; consult your user's manual for exact parts listings.