point. It's a good conductor of heat. Brass resists corrosion, including galvanic corrosion from saltwater. Brass is easy to cast. Brass is still commonly used in applications where corrosion resistance and low friction are required, such as locks, hinges, gears, bearings, ammunition casings, zippers, plumbing, hose couplings, valves, and electrical plugs and sockets. It is used extensively for musical instruments such as horns and bells.