This is an optional RPM Rear A-Arm Set, and is intended for use with the Traxxas 1/16 Slash 4x4, Ford Fiesta, Ken Block Gymkhana, Ford Mustang Boss 302, Kyle Busch Race Replica & Rally VXL vehicles. RPM rear A-arms follow all of the same indestructible characteristics RPM customers have come to expect. These rear A-arms eliminate nearly all of the A-arm slop found in stock components, which allows camber, caster and toe angle settings to be more firmly fixed in position. The result: A smoother, more consistent suspension system with a significantly reduced tendency for the vehicle to randomly wander while driving. Unique to RPM suspension arms, are angled leading and trailing edges. RPM incorporates a 30-degree bevel in these areas, which reduces the chance of breaking suspension parts since the A-arm will naturally try to transition over objects instead of bluntly plowing into them. RPM rear A-arms for the Traxxas 1/16th scale Slash 4x4 are sold in sets of four – including both upper and lower a-arms. RPM 1/16th scale Slash 4x4 A-arms, like all RPM molded products, are backed by RPM's industry-leading warranty against breakage for worry-free operation.