Traxxas 7158 Rocker Arms with Plastic Bushings, Progressive 2 (set of 4) Use Traxxas stock and hop-up replacement parts to get the most out of you Traxxas RTR vehicles This product is made from high quality materials and designed for lasting performance This is for use on RC vehicles such as the Traxxas 1/16 Line-Up; consult your user's manual for exact parts listings