Copper Balls has great electrical and heat conductivity and is sensitive to corrosion from a variety of agents. It is a relatively soft metal. Copper Balls should not be used where exposure to corrosive agents or high mechanical pressure are factors. Phosphorised Copper Balls are widely used in manufacturing of electrical circuit channels by PCB manufacturing units. Copper Balls are readily available in 15, 25, 40 and 50 mm diameter sizes.