The ICON Vehicle Dynamics 2007-2018 Jeep Wrangler JK 4.5" lift rear coil springs are designed for drivers demanding the ultimate in performance and ride quality, while allowing for increased wheel travel (when used with ICON shocks) and the fitment of larger tires. The ICON Jeep JK coil springs provide 4.5" of rear lift height over stock and feature a dual rate design. The dual rate design allows for a softer initial rate for superb on road comfort and a firmer secondary rate that increases during compression for excellent bottoming resistance and off-road performance. Like all ICON coil springs, they feature a lifetime guarantee against sagging/breakage to produce confidence in knowing that you have the best suspension products available for the 2007-2018 Jeep Wrangler JK. The ICON Vehicle Dynamics 2007-2018 Jeep Wrangler JK 4.5" lift rear coil springs are designed for drivers demanding the ultimate in performance and ride quality, while allowing for increased wheel travel and the fitment of larger tires. TECH NOTE: ICON*s advertised lift heights are based around a typical Jeep JK build which usually includes added weight of accessories such as heavier rear bumper/spare tire. Lift heights may be higher than advertised if installed on a stock weighted vehicle.