Driveshafts, rear, steel-spline constant-velocity (complete assembly) (2)Extreme heavy-duty steel CV (constant velocity) driveshafts for the Traxxas Hoss are engineered to satisfy the performance and durability needs of the most demanding drivers. Designed specifically for monster truck applications, these shafts are built to withstand the brutal torque of Hoss' 540XL motor and the massive grip of the huge Sledgehammer tires. Traxxas' unique, splined telescoping design delivers full-range articulation, so there is never a need to limit suspension travel. Since they are made by Traxxas, you can count on easy installation and perfect fit in your Traxxas model.