Steel spur gear, 54-tooth (1.0 metric Pitch, 20° pressure angle) delivers the ultimate in durability and heat resistance for the x-maxx 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.