Hinson Clutches are championship proven by almost every major factory team and rider in the world, including Eli Tomac, Ken Roczen, Cooper Webb, Tim Gajser, Jeffrey Herlings, Jeremy Seewer, Chase Sexton, and Joey Savatgy. Springs manufactured from high-temperature steel, highly resistant to losing their strength due to the high heat of today's four-strokes. Provide optimum hookup with minimum heat build up. Exceptional production tolerances. Developed to enhance the performance of any Hinson Clutch Component and your stock clutch alike. Works with all O.E. parts unless otherwise indicated. Sold as a kit. Made in the U.S.A.