Improves clutch performance, clutch life and heat dissipation. Used by all major factory teams and riders. Precision machined from billet T-6 aircraft quality aluminum to aerospace tolerances, and Akadized for 5 times the wear resistance to stock, with proper maintenance. Allows clutch assembly to spin more true creating less heat when clutch is disengaged. When used with Hinson Clutch Components clutch basket and inner hub helps eliminate clutch chatter.