RPM Jato A-arms are designed using stock geometry, making them direct, bolt-in replacement parts. Furthermore, weve reduced the clearances around the hinge pins and A-arm mounting areas to help reduce slop in the suspension system, providing better, more consistent camber, caster, toe, and wheelbase settings. RPM Jato A-arms use stock mounting hardware nothing more to buy. RPM A-arms for the Traxxas Jato are sold in pairs, and are molded in blue or black from our bulletproof blend of top-secret materials for the ultimate combination of strength, durability, & wear-resistance in a lightweight set of A-arms that wont leave your wallet empty!