Hinson Inner Hub | H361-IH-1801. Used by most major factory teams and ridersImproves clutch performance and lifePrecision machined from billet T-6 aircraft quality aluminum to aerospace tolerances. Hard coated for five times the wear of OEM units,(with proper maintenance)Allows clutch assembly to spin more true resulting in much less heat build-up during both clutch disengagement and engagementWhen used as an full assembly helps- Hinson Inner Hub | H361-IH-1801.