This purchase is for a set of engine case covers for the Honda CBR1000RR Non ABS, designed protect your bike engine and stator in the event of a low-side. The case 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.