Bronze, sometimes referred to as yellow bronze, is an alloy, meaning it is a mix of metals. Its main metal is always copper, which usually ranges from 75-85% of the alloy, with tin making up the majority of what is left. Some other metals that may be added to this alloy are aluminum, manganese, nickel, and zinc. The copper is what gives bronze its yellow colour.

White bronze is effectively the same as bronze, except it contains a much lower percentage of copper. It is often a roughly equal mix of copper, tin, and zinc.