Brass is an alloy of copper and zinc. If it is only composed of copper and zinc, it is called ordinary brass. If it is a variety of alloys composed of two or more elements, it is called special brass. Such as copper alloys composed of lead, tin, manganese, nickel, iron, and silicon. Brass has strong wear resistance. Special brass is also called special brass, which has high strength, high hardness and strong chemical corrosion resistance.