These high-quality dog tags are made of 316L Surgical Stainless Steel. The deep engraving ensures that the BYU Sailor Cougar and Cougars script engravings will never fade or rub off. They will never tarnish, rust or turn your finger green. The stainless steel holds up to water, humidity, chlorine, etc., allowing you to rep your Cougs anywhere and everywhere 24/7.