6851RDriveshafts, front, steel spline constant velocity (complete assembly) (2) Traxxas Steel Constant Velocity Shafts offer the ultimate in torque handling and efficient power transfer. The outer U joints are lubricated and sealed by a rubber boot for maximum protection against the elements, and the U joint pins are held captive so you never have to worry about losing a pin. Gleaming nickel plated shafts and black silicone boots add a custom look.