These Teflon Lined Series Bearings have 3 components; the ball, the liner and the outer race. The ball is inserted into the body and the body is then swaged around the ball to lock it in and it is then loosened to allow it to move. The body is made from Carbon Steel. These bearings are ideal for use in areas which require a tight fitted ball. These bearings are ideal for use in areas where the joint is constantly in motion as the liner insures the ball moves freely without any knocking or play being induced. These are commonly used in motorsport and on industrial equipment.