Material = UHMW-PE (ultra high molecular weight polyethylene). NO CUT or modification required. Fit Models: Kawasaki 2011-2017 ZX-10R You will receive the exact kit in the top most picture!!! This purchase is for a pair of case sliders or case covers that helps protect your bike in the event of a low-side. The covers 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. They can be inexpensively replaced in case of a low-side. The bolts are made of highest grade commercially available 12.9(177,000 psi in tensile strength). Rest assured that you are getting the best material and fully thought out product.