Belt Drives Ltd. Kevlar Clutch Kit for Harley Davidson 1990-97 Big Twin, 1991-2 Clutch plates are made of either 6061-T6 or high tempered steel with Belt Drives Ltd. race proven Kevlar material Each Plate design was tested so that the maximum performance is achieved All Big Twin kits are packaged with frictions and steels and a pre-measured stack height for easy installation. Different groove patterms were designed for maximum oil circulation and heat dissipation Friction Plates: 8, Steel Plates: 6