Inner Hub Cr250/Crf450Billetproof Inner Clutch HubImproves clutch performance and longevity by improving heat dissipation Allows clutch assembly to spin more true so less heat is created when clutch is disengaged Machined to aerospace tolerances from billet T6 aluminum Akadized surface will last five times longer than stock if properly maintained Help eliminate clutch chatter when used with Hinson clutch basket and pressure plates Made in the U. S. A.