Cane Creek Progressive Rate VALT coil springs are designed to provide riders with a true rise-in-rate spring curve.Springs feature the progressiveness and ramp-up that hard-charging riders demandDesigned for use with Cane Creek Coil shocksProgression begins at 50% into the stroke of the springCrafted from high-performance spring steelInner diameter of 36.5mm is compatible with all Cane Creek coil shocksItem SpecificationsI.D. (mm)36.5MaterialSteelSpring Weight400-488Stroke (ins)2.17 Cane Creek Progressive VALT Spring Rear Shock Spring UPC: 840226083032