Complete Billetproof Conventional Clutch Kit - YZ450F Improves clutch performance and life, Improves heat dissipation, Precision machined from billet T-6 aircraft quality aluminum to aerospace tolerances, and hard coated for five times the wear resistance to stock (with proper maintenance), Allows clutch assembly to spin truer creating less heat when clutch is disengaged and provides a more positive smooth clutch engagement, Helps eliminate clutch chatter