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Complete kit to upgrade your clutch. Manufactured from valve spring quality material, shot-peened and stress relieved SPECIFICALLY to handle the heat and stress of high power drag-style sport bike launches. Brock's new springs are guaranteed for millions of trouble-free (and SAG-free!) cycles. We spared no expense to produce a spring for your late model rocket...neither should you. This kit includes shim spacers to increase clutch spring pressure and prolong clutch life. Helps increase E.T. and MPH.