What The Duck - Pet ID Tag, 2 Sided Full Color, 4 Lines Custom Personalized Text Available 2 Sided Pet ID Tag. Full color designs. 1.25" round. Customized - you get to provide 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. Please place "customized text" in the GIFT MESSAGE field. Up to 4 lines, 25 characters each line.