Copper Brass: Moses Made the Serpent of
Source: TTT
Numbers 21:9
So Moses made a bronze snake and mounted it on a pole. If anyone who was bitten looked at the bronze snake, he would live.
2 Kings 18:4
He removed the high places, shattered the sacred pillars, and cut down the Asherah poles. He also demolished the bronze snake called Nehushtan that Moses had made, for up to that time the Israelites had burned incense to it.