This is a set of optional ST Racing Concepts Blue CNC Machined Aluminum Front A-Arms. CNC Machined from high grade aluminum material, these aluminum Front A-arms will bullet proof your Traxxas Stampede, Rustler, or Slash, as well as the Nitro 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.