Features: Maximized Durability with Patented Fixed-Pin hub using steel-on-steel contact with drive plates - The most durable clutch hub available, No more notching or performance degradation Developed and Proven with professional race teams like Star Racing Yamaha More Friction Disks in the same footprint with TorqDrive = Improved power transfer to the rear wheel Billet Aluminum Core Components including pressure plate and Fixed-Pin inner hub reduce clutch operating temperatures with improved oil flow for longevity and consistent performance Tunable to Power Needs and Rider Preference with interchangeable clutch spring combinations to match engine output and desired engagement Comprehensive Clutch Kit - Includes Fixed-Pin hub, billet pressure plate, TorqDrive clutch pack, basket sleeves, two sets of springs (coil spring systems only), and billet clutch cover (DDS models include inner hub and dampers)