No, according to query 520, brass itself has no collection value, because brass is made of copper and zinc in a certain proportion according to the required properties. Its technology is simple, its use is wide and its quantity is large, so the brass dumbbell has no collection value. Brass is an alloy of copper and zinc. Brass composed of copper and zinc is called ordinary brass. If it is a variety of alloys composed of more than two elements, it is called special brass.