This is a basic single add-a-leaf designed to re-shape the stock springs while fixing the poor Xterra rear spring ride. Made in the USA wit hhigest quality spring steel and teflon wear pads. These offer 1.5" of lift and smooth the transition from ride height to compressed height. 90% of the harsh bottoming from the soft factory spring will be fixed by just adding these while actually improving the ride quality over stock. These are designed to replace the factory overload spring but can be used in conjunction with the overload, but, again, is not recommended (longer ubolts will be required). Kit comes with 2 springs and new center pins.