high performance clutch bell with patented R-Vent system for more intake air over the clutch preventing wear and loss of friction. Lower operating temperature and great grip. Low weight means better acceleration. Great value for money in the high-end sector and must have for any modified transmission. For a great independent review on the clutch bell see: http://www.tuningmatters.com/reviews/clutches-and-clutch-bells/review-naraku-v-2-cnc-clutch-bell