RPM Revo A-Arms are the only alternative to bulletproof performance that rivals any competition! Check out this laundry list of awesome features: Nearly identical in weight to stock A-Arms Redesigned for incredible durability under the toughest of conditions More wear resistant than any other material available Excess A-arm endplay has been eliminated for more accurate caster and toe angle settings Angled leading and trailing edges eliminate dirt build-up No low-hanging cross-braces or shock mounting areas providing better ground clearance Massive shock rod mounting areas for improved rigidity Available in black, blue, & dyeable white Less than half the price of aluminum A-arms Molded from our bulletproof blend of nylons and backed by our world renowned breakage warranty Sold in sets of one upper and one lower A-arm. The Traxxas Revo Requires one package of Left Front A-arms, one package of Right Front A-arms, and two packages of Rear A-arms to complete one entire truck.