this is a CNC machined AL7075 motor rotor prototype, AL7075 is one of best Aluminum alloy with high strength, strong abrasion resistance and corrosion, easy to process and oxidize, widely used in the aerospace industry and aircraft parts,key dimension tolerance +/-0.01, Ra 0.4 fine finish, for precision components, we suggest that our customer could provide match part so that we can get the best assembly effect.