CNC Machined from high grade aluminum material, these aluminum Front A-arms will bullet proof your Traxxas Stampede, Rustler, or the new Slash. For smooth suspension operation, the hinge-pin holes are fitted with machined delrin inserts. Each set of A-arms also comes with high-grade steel hinge-pin set w/e-clips. Solid in design and construction. (1 pair) Go aluminum...because real trucks don't have plastic arms!