Copper is a good electricity conductor (second only to Silver) but much cheaper than silver. the good electricity conductivity cause reduce energy which lost in heat form. The other outstanding point of copper is every good resistant to corrosion, even in strongly corrosive condition such as in Sea Water. However, the weak point of copper is low strengthness, so usage has limit.
By the way, Copper Plating usually use for foundation or plating the first layer of part, then plating with another metal in further.
Copper is appropriate for plating electronic parts because its property is good conductivity. Besides, copper is quite expensive, so customers prefer to plating with another cheaper metal for cost reduction Therefore, able to says that it makes economized.
Our company pleased to plating both Racking system for big parts and Barrel system for small parts.