Energy One E1 Cltch Kit Buell Blast Frict BB-21 All clutch plates are made of either 6061 T6 or high-tempered steel with our own race proven Kevlar material. Each plate design was tested so that maximum performance is achieved. Different groove patterns were designed for maximum oil circulation and heat dissipation. The steady flow of lubricant will cool and determine the longevity of your clutch. Includes 5 Kevlar friction plates on tempered steel cores