The Super Alloy Racing Spring Spacer Kits allow for SAR Coil Springs to fit on different shocks like Fox/Marzocchi, RockShox and CaneCreek/Ohlins. Must purchase a POM spacer kit to fit springs for each shock In addition to universal compatibility, these adapters reduce spring bind-up and reduce weight by enabling the use of the shortest possible spring POM (polyoxymethylene) is a CNC grade polymer, allowing machining to precision tolerances while also preventing spring binding during use