Our 270mm Solid Wave Rotor is made by Galfer exclusively for Ride Eng. The special grade stainless/iron alloy material is imported from Japan, manufactured in Spain, then imported to the US and is a favorite among most of the top level motocross teams. Beware of cheap aftermarket rotors like those imported from China, the material used may hinder braking performance. This solid wave is made to last, is very light weight (1lb 1oz) and offers more stopping power than the stock 250mm disc (270MM Hanger bracket required for 2006-2017 RMZ450 & 2007-2018 RMZ250). Note for 2018+ RMZ450 & 2019+ RMZ250 this disc is the same size as stock and no hanger is required.