TRAXXAS Drive cups, inner Revo/Maxx (steel const-veloci driveshafts) (TRX5153)
Constant velocity (CV) driveshafts concentrate mass for less overall rotational mass than the stock driveshafts. This results in even quicker acceleration. Both the inner and outer joints anre lubricated and sealed by rubber boots to reduce maintenance and project against wear caused by dirt and grime. The U-joint pins are held captive by the ball bearings so there's never a worry about losing a pin.