This kit fits 2012-2015 ProClimb models and transforms them into a custom High Performance driven clutch. This clutch features: ¥ Faster acceleration ¥ Improved backshift. ¥ Clutches that run cooler. ¥ Improved Belt life. ¥ Holds engine rpm's, allowing more HP to be transferred to the ground. ¥ Complete kit includes: Billet Cover Plate, Billet Helix, Torsional spring, torsional Spring Perch, CPC Aero-space Rollers and stainless steel roller bolts. ¥ This kit is ISR Race Legal. ¥ 100% bolt on. ¥ Your choice of helix 38, 38/44, 38/46, 42/36, 42/38, 42/48, 44/42, 44/40, 46/42, 50/44. Feel free to call us at 801-224-5005 and CPC can customize to your rider weight, elevation, and engine mods. (WE WILL CONTACT YOU TO CUSTOMIZE YOUR KIT)