Each upper and lower control arm is equipped with a Rough Country flex joint. In the lower portion of the photo, you can see some of the components of these joints. Each has an eye ring made from 5/16-inch steel, hardened washers, injection-molded bushings, steel zinc-coated internal pivot ball, and hardened snap rings. At the top of the image is an assembled flex joint, and as you can see, they are greasable. They are also rebuildable.