Medical Alert, Diabetic - Pet ID Tag, 2 Sided, 4 Lines Custom Personalized Text Available FUN! 2 Sided Pet ID Tag. Full color designs. 1.25" round. CUSTOMIZED - you provide up to 4 Lines of Customized Text for the back. ID Tags are made of lightweight, durable Aluminum The ID tag design and customized text are permanently boded to the tag. PROVIDE your "CUSTOMIZED TEXT" in the GIFT MESSAGE field. Up to 4 lines, 25 characters each line.