Our Aluminum Black Large Bone Pet ID Tags are made of colored anodized aluminum (AL). Each tag comes with 1/2 inch stainless steel split ring. The Aluminum Black Large Bone Pet ID Tags are professionally engraved providing you with maximum wearing time without loss of information through use. The Aluminum Black Large Bone Pet ID Tag can handle 1 to 3 lines of personalization with 13 characters per line of information.