Generally copper alloys exhibit good to excellent corrosion resistance and high thermal conductivity and very high electrical conductivity. Hot or cold working is possible. Cold working increases the hardness and strength and requires frequent annealing Small amounts of alloying elements are often added to it to improve certain characteristics. Alloying can increase or reduce the strength, hardness, electrical and thermal conductivity, corrosion resistance, or change the color. .Applications include architectural uses, coinage, condenser/heat exchangers, plumbing, radiator cores, musical instruments, locks, fasteners, hinges, ammunition components, and electrical connectors.