CNC Machined from high grade aluminum material, these ST Racing Concepts Aluminum Rear A-Arms are made specifically for the Traxxas Slash 2WD. Aluminum A-Arms add great strength to the rear suspension of your Traxxas Slash, and when combined with our aluminum front A-arms (ST3631) it provides a bullet proof setup for your Traxxas Slash. For smooth suspension operation, the hinge-pin holes are fitted with machined delrin inserts. A-arms now come with heat-treated carbon steel polished lock-nut style hinge-pins. Solid in design and construction and anodized Green.