07-18 Wrangler JK, 4-Door;2.5 lift height;Progressive coil springs;Complete set of 8 adjustable upper and lower control arms;High clearance adjustable front track bar;Rear sway bar end links included;Shocks are not included;Lifetime Rubicon Express Advantage Lifetime Warranty;California Residents: WARNING The all-new 2.5 super-flex suspension system is designed for enthusiasts looking for the best short arm suspension system that maintains the factory mounting systems while keeping a low center of gravity. The 2.5 super-flex features great ride quality and unmatched performance. Features include adjustable upper and lower control arms featuring our PT-Meg bushings and serviceable super-flex joints, adjustable front track bar and tuned coil springs. Progressive coils have a longer extended length vs. linear coils, maximizing droop travel. The progressive spring rate also results in a smooth ride over small bumps with enough spring rate to prevent harsh bottoming during full compression.