RockJock's 4-inch lift rear coil springs for 1997-2006 Jeep TJ Wranglers and LJ Unlimiteds replace factory springs and are designed to work with RockJock Johnny Joint® suspension systems or other manufacturer's 3 to 5-inch lift kits. This pair is our increased-rate rear springs for improved ride quality and height control when the vehicle is carrying a little extra weight (ice chest, tools etc.) These springs feature a dual-rate with a combined rate of 79lbs. and a free length of 17.75-inches. Finish is gloss black powder coat. Extensive research was done by RockJock to develop the perfect spring rate and quality of the coil springs. The results: they provide the best in comfortable ride and excellent performance off-road. If you off-road with heavy loads (large spare tire, camping gear, fuel/water etc.) then our CE-9131RH3P springs with a little extra height might be a better option. If you need help choosing the correct springs for your Jeep - just call the RockJock sales staff!