Barnett clutch kits are designed to tolerate whatever you can deliver with their top quality construction and components. Barnett has been developing their burly clutch kits since 1948 for dirt bikes, street bikes, and ATVs. The Barnett clutch kits are built with Kevlar fiber plates. Kevlar is the same material found in bullet proof vests, which make these clutch kits extremely tough. Barnett clutch kits also include durable tempered steel friction plates that have been processed through their vibratory deburring followed by flatness testing to ensure optimum performance. The heavy duty clutch springs have also been produced for durability by using shot-peened processing and heat treating. Expect better clutch feel, performance and abuse control when you install the Barnett clutch kit in your application. Note: not all street bike kits will include fiber plates, friction plates and heavy duty springs.