An alloy of copper and zinc, brass is cost-efficient and highly durable, and exhibits excellent heat and corrosion resistance, making it an ideal substitute for a number of other, more costly metals and alloys. With its low coefficient of friction, brass is the preferred material for applications such as gears, locks, bearings, and the like. It is naturally antimicrobial, making it well-suited to medical applications. And, because it is non-sparking, brass is commonly used to make components for use in potentially explosive or flammable environments.