This is an optional Traxxas Rear Steel Constant-Velocity Driveshaft Set, and is intended for use with the Traxxas Bandit, Bandit VXL and Drag Slash. 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 superior protection against the elements, and the U-joint pins are held captive so you never have to worry about losing a pin. Package includes two pre-assembled driveshafts and two driveshaft pins.