The 4" X-Series lift kit for the Jeep Wrangler TJ, Unlimited by Rough Country includes front & rear coil springs, front & rear upper and lower adjustable X-Flex control arms, track bar drop brackets, front adjustable track bar, front &r ear stainless steel brake lines, power steering pitman arm, front sway bar disconnects and four Nitro shocks. Shock boots sold separately. The X-Flex control arms include Clevite OEM style rubber bushings, flex joints with 2.5" diameter body and huge 1.25" threads that are adjustable from stock up to 6" of lift. All joints are greasable and fully rebuildable. Upper joints pivot up to 20 degrees, Lower joints pivot up to 35 degrees.