Traxxas 24-tooth 48-pitch metal pinion gear fits 3mm shaft. Used in 4-Tec 2.0 models. 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.