Materials = UHMW-PE (ultra high molecular weight polyethylene) and a aircraft grade aluminum 6061-T6. NO CUT or modification required. Fit Models: Honda 2008-2015 CBR 1000RR This purchase is for a two Engine Stator Clutch 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.