MRP Enduro SL Spring The MRP Enduro SL Spring is used on the MRP Hazzard rear shock and is a lighter replacement for the stock steel spring. If you bottom out your shock every time you get airborne, you may need a spring with a higher spring rate. If you have a hard time getting through your shock's travel, you may need a spring with a lower spring rate. The coil is produced in many lengths and spring rates to accompany any size rider on any MRP Hazzard shock. Whether you are changing your spring rate, or just want a lighter spring, the Enduro SL spring is a worthy upgrade for your shock. Features Compatible with:MRP Hazzard rear shocks SL Spring is lighter than stock steel spring that comes on shock Multiple spring ratesfor every size of riders No special tools neededfor install to shock SPECIFICATIONSShock Stroke65mm Coil Lengths111, 115, 118, 120, 123, 124, 127mm Spring rates375, 400, 425, 450, 475, 550, 500, 600 lbs. | Mrp | Enduro Sl Springs 450Lb / 65Mm Stroke, 118Mm Long