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 Replacement Aluminium throttle sleeves including bearings to fit our Apico fast action trial throttle THROTTLE T FAST API and also the Domino fast action trial throttle 1800.03 using the white coloured sleeves.