Increase ground clearance and wheel travel 1"-2" on most models Rugged double-steel-wall construction Progressive rate springs for comfortable ride and improved load-carrying capacity Five-position spring pre-load adjustment for varying loads Gas charged for fade-free operation Durable fabric Shock Sox are included to protect shocks from rock, sand and mud damage Shock Sox are easily removable with hook-and-loop fasteners for cleaning and adjustments Not compatible with lift kits. 512 SHOCK TRX300 RR