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 THROTTLE SLEEVE ALLOY INC BEARING - BLUE YAMAHA YZ125 97-25 YZ250 97-25 YZ125X 20-25 YZ250X 16-25