In-built bearing and anti-friction sleeve offer an unrivalled feel and super-smooth action to the twist grip. Sealed bearing at the outer end of the tube reduces friction. Anti-friction sleeve at the cable end. Dirt cannot get in between the tube and bar. Makes cleaning the throttle tube a thing of the past COMPLETE THROTTLE OEM - 53140-KRN-A30 OEM - 53167-MKE-A00 OEM - 53168-MKE-A00 HONDA CRF250R 18-25 CRF450R 17-25 CRF450X 19-25 CRF450L 19-20 CRF450RL 21-25 CRF250RX 19-25 CRF450RX 17-25