Increase ground clearance and wheel travel 1''-2'' on most modelsRugged double-steel-wall constructionProgressive rate springs for comfortable ride and improved load-carrying capacityFive-position spring pre-load adjustment for varying loadsGas charged for fade-free operationDurable fabric Shock Sox are included to protect shocks from rock, sand and mud damageShock Sox are easily removable with hook-and-loop fasteners for cleaning and adjustmentsNot compatible with lift kits