The rotor of our alternators use Nd-Fe-B permanent magnet materials. And the housings use Aluminum Die Casting. It designed by the motor expert. The alternator has the merits: Light weight, easy to start up, compact structure, easy maintenance, high reliability and efficiency. Also, there is another advantage. There is no solder in our products, so you don't need to worry about the solder joint melted under the high temperature.