These arms are built from high strength steel, boxed, gusseted and fully welded for strength and rigidity. At the frame mount they use OE style rubber bushings for a long service free life and quiet operation. At the other end these arms feature an indexed ball joint cup designed for use with leveling and lifted applications. High strength ball joints are used with a protective ball joint cap to keep debris out. These upper control arms come fully assembled and ready to bolt in right out of the box.