A brass component is a combination of COPPER, ZINC, and sometimes other metals such as tin or aluminum. COPPER and ZINC are the two main components, with COPPER making up the majority of the material. The ALLOY is then formed by combining these metals in specific proportions. TUBA is a type of brass instrument that is made from a brass ALLOY. It is composed of COPPER, ZINC, and sometimes other metals such as tin or aluminum. Alloys are created by combining different metals in specific proportions to create a material with desired properties.