All SIRUI TY Series Quick Release Plates are made from forged aluminum alloy. The forging technique produces high-density metals with much greater strength than die-cast methods.When using long lens or heavy cameras, it is very important to make sure that there is a perfect fit between the camera and quick release plate. For that reason, SIRUI offers a selection of quick release plates for different types and models of cameras.TY Series QR plates are designed with slide-stopping rubber mats to prevent the camera/lens from moving while tightening the screw.The red anti-twist stoppers are designed to prevent the camera from shifting or twisting as you move the ball head.