The M.O.R.E. (Mountain Offroad) aircraft quality 6061-T6 aluminum body lift pucks will not crush, break or slip once bolted into place. A 1" body lift may not sound like much, but once installed, your Jeep CJ5 or CJ7 will allow a larger tire by moving the body away from the frame and it won't look like it's been lifted. The natural aluminum color also looks great under your rig. Also included are specially formulated Polyurethane bushings that are soft enough to allow flex yet tough enough to withstand heavy duty abuse. They will not 'squeak" or make noise. The factory tube/sleeves must be re-used for Jeep CJ5 or CJ7 applications.