T-Rex Racing 2013 - 2017 Yamaha FZ-09 / MT-09 / FJ-09 Engine Case Covers Material = UHMW-PE (ultra high molecular weight polyethylene) and a aircraft grade aluminum 6061-T6 NO modification required Fit Models = 2013 - 2017 Yamaha FZ-09 / MT-09 / FJ-09