Supreme Pro lift kits are engineered to accurately lift and level your truck for a truly customized ride. Each front lift component is CNC machined from solid billet aluminum blocks. The rear lift spacers are CNC machined from Delrin for its high strength and light weight making it the perfect lift to accommodate the rear stresses. These spacers will never compress or warp even under extensive load.. IMPORTANT: Will not fit vehicles equipped with an Air Ride / Magnaride / Auto-Leveling suspension.