This is optional set of Traxxas Hard Anodized Teflon Coated Big Bore Rear Shocks. Traxxas Big Bore shocks provide ultimate damping control. They’re hard-anodized, PTFE-coated and have large cylinders for greater oil capacity. These shocks also include our super smooth, long wearing titanium nitride (TiN) coated shock shafts. Adjustments are a snap with clip-on spring pre-load spacers and installation time is reduced because the shocks are sold pre-assembled.