Central Drive Shaft 111mm very long is made of world-renowned HUDY Spring Steel and features 2.5mm drive pins for maximum drivetrain efficiency. The drive shafts are worldwide's thinnest yet most durable drive shafts utilized in electric off-road cars. Hardened with a proprietary solidifying procedure, the drive shafts provide unbeatable lifespan and reliability. The safety collar on front driveshaft secures the pin, even though the ball bearing captures the pin in back axles, both steering clear of the pin from coming lose during a run Fits XB4'21