This is a replica of the shield used by Percy Jackson in The Lightning Thief to kill the hydra. The antique gold colored pendant is 1 and 1/2 inches in diameter and is made of zinc-alloy that has been plated in gold and given an antique finish. The pendant is on an 18 inch cord with a 2 inch extender chain. We recommend that you upgrade the chain to a 24-inch brass chain.