This purchase is for engine guards for the above bike model. The replaceable skid plates can be inexpensively replaced without purchasing a new set of steel guards. The steel tubing is bolted to the engine mount of the bike and the slider puck is bolted onto it. The steel tubing has two attachment points braced together to prevent them from rotating in the event of a low side. The engine guards are braced together by a crossbar in order to increase their strength. The bolts are made of the highest grade commercially available 12.9(177,000 psi in tensile strength). The long bar is made of billet aluminum. Rest assured that you are getting the best material commercially available.