The Super Alloy Racing POM Bearing system allows your SAR spring to fit any shock on the market. In addition to universal compatibility, these adapters reduce spring bind-up and reduce weight by enabling the use of the shortest possible spring.POM Bearings are required to fit your shock and are sold separately.POM (polyoxymethylene) is a CNC grade polymer, allowing machining to precision tolerances whilst also preventing spring binding during use.*** Super Alloy Racing Springs NEED the POM Spacer Kit to convert to your shock, make sure to get the POM Spacer Kit that matches your shock.Fits Fox/Marzocchi, PUSH (set of 3) Super Alloy Racing SAR POM Spacer Kits Rear Shock Part UPC: 5060719340328