Feigao brushless motors, include IPS(Indoor Power System), B20, B40 and B50 series. We are the first company in the world to make 120 IPS brushless motors for R/C market. With high quality UHT magnets and copper wires, all of our brushless motors are work fine with 150c. 580 ferrous free loss BL motor is new structure motor. It has higher efficiency and it's a perfect replacement for oil engine helicopter.