This is a set of optional RPM Rear Upper & Lower A-Arms, and are intended for use with the Traxxas 1/16 E-Revo. RPM Mini E-Revo rear A-arms are everything you have come to expect from RPM replacement parts – durable, performance-oriented, good-looking, slop free and strong! Similar to RPM front A-arms, the rear versions eliminate nearly all of the A-arm slop, which allows camber and toe angle settings to be more solidly fixed in position. The result: A smoother, more consistent suspension system with a significantly reduced tendency for the truck to randomly wander while driving. RPM rear suspension arms match the same design elements as the fronts: Angled leading and trailing edges. By incorporating a 30-degree bevel in these areas, the chance of breaking suspension parts is reduced, since the A-arms will naturally try to transition over objects instead of bluntly plowing into them. RPM rear A-arms for the Traxxas Mini E-Revo are sold in sets of four – both upper and both lower A-arms. What’s best is these miniature E-Revo A-arms, like all RPM molded products, are backed by RPM's industry-leading breakage warranty. If it breaks (under normal operating conditions), send it to RPM and they replace it!