This purchase is for a pair of frame sliders for the above models. They are suitable for track use. The slider pucks are made of UHMW-PE (ultra high molecular weight polyethylene), a tough plastic with good strength, wear resistance and dimensional stability. It is more dimensionally stable than Nylon and used in many industrial ball bearing and friction reducing applications. The bolt is made of solid stainless steel. Rest assured that you are getting the best material commercially available.
