Traxxas TRX-4M Aluminum GTM Shocks. These optional shocks are a great way to add performance and a custom look to your TRX-4M rock crawler. Constructed from hard anodized 6061-T6 aluminum the shock bodies can handle harsh conditions and provide long lasting reliability. The GTM shocks offer smooth and consistent suspension travel helping your TRX-4M conquer the most aggressive terrain. Package includes four pre-assembled shocks, four pre-load spacers and one bottle of shock fluid.