Traxxas Hardened Steel 18T Pinion Gear 0.8 Mod (compatiable w/32 pitch) Fits 5mm Shaft for E-Revo. #5644 FeaturesUse Traxxas stock and hop-up replacement parts to get the most out of you Traxxas RTR vehiclesThis product is made from high quality materials, and designed for lasting performanceThis is replacement hardware for use on Traxxas vehicles, consult your user's manual for exact parts listings