Primary Clutch - EBS - Polaris Complete assembled clutch including spring and weights, Every clutch is factory balanced to ensure they turn straight and true, Aluminum and magnesium construction is strong and light weight, Heat treated center shaft for unequaled strength, Larger diameter spider buttons have more contact area for longer life, Uses the same clutch puller as the OEM clutch, Accepts any brand of drive belt, Some models may require using your spring and weights to ensure proper operation for your machine.