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Factory Pro Racing carries slipper clutches from Surflex, STM and Hinson for all the major Japanese & European Brands. All the slipper clutches aid in anti-hop & engine braking in Supermoto and motocross applications. Each slipper clutch can be finely tuned with various spring rates. All professional Supermoto and Supercross teams utilize slipper clutches to decrease the lap times.