We are specialist in manufacture of bi metal washers in copper + aluminum i.e. One side copper and one side aluminum. The copper and aluminum composition is in the ratio 80:20 (80% aluminum, 20% copper). These are plain washers but with two different metals on wither side. We can also manufacture the same according to the composition of copper and aluminum that you require. these can be manufactured in mm & inches as per your requirements, specifications & drawing or as per the sample provided by you.