This rear sway bar is constructed of 22mm solid 4140 chrome moly. Our bar stock is 4140 chrome moly heat treated spring grade steel. The bar is entirely heat formed and coined as one piece.  We put our bar through this extensive process to insure that the final product will be the strongest, most durable bar on the market, and that it will be the most resistant to form alteration. Most aftermarket anti-sway bars are cold-bent, making them weaker at the bends, and more vulnerable to shape alteration.