Traxxas 5151R Steel Constant-Velocity Center Driveshafts Steel Constant-Velocity Center Driveshafts are designed to handle extreme horsepower and articulation Inner and outer U-joints are lubricated and sealed by a rubber boot for maximum protection against the elements U-joint pins are held captive by a lightweight aluminum sleeve so you never have to worry about losing a pin Nickel plated steel shafts, blue silicone boots, and red-anodized aluminum accents Use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles