These arms will give you smother travel and greater strength. These arms use 1" uni-balls and 17-4 stainless steel spacers. Energy Suspension urethane bushings are used to replace the stock rubber bushings that bind the upper arms and add stress to the upper A-Arm mounts. We incorporate a 7/8" internal pivot sleeve for the urethane to pivot on. A new feature is grease fittings for the urethane bushings. These arms add strength and wheel travel for high off-road demands.