The regulator is made of carbon and copper this two main material .to make a good position to finish the whole progress.

This carbon regulator is good quality ,and reasonable price .and i think it is the best choice for

you .

Advantage :

1) good  contact action

2) reduce pressure

3) revolves unimpended

Such as this sample ,we can provide you more information about it if you contact with

us ,thank you .

carbon brush