This is an optional Traxxas CV Driveshaft Set, and is intended for use with the Traxxas T-Maxx 3.3, Revo 3.3, E-Maxx and E-Revo trucks. Traxxas Steel Constant Velocity Driveshafts are designed to handle the extreme horsepower and articulation that a T-Maxx or Revo can dish-out. The inner and 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 by a lightweight aluminum sleeve so you never have to worry about losing a pin. The nickel plated steel shafts, blue silicone boots, and red-anodized aluminum accents not only look good, they are designed to exacting specifications for ultimate strength and performance. These are simply the most advanced steel CV driveshafts available for the Maxx and Revo trucks.