The Yin Yang Pet ID Tag is an ode to the ancient Chinese symbol for dualism and opposites coexisting. Dogs and mailmen can live in the same world. So long as those pesky mailmen get off of my lawn! Keep it moving! Peace and harmony. See! Dogs totally get it. The Yin Yang Pet ID Tag celebrates the balance our pets bring into our lives. Free engraving. Add your dog's name for a pet ID tag! Can be customized with up to four lines of text on the backside. Our laser-engraving is guaranteed to last so your pup’s way home will never rub off. Make sure to include your engraving details in the 'Type Pet ID Information Here' text box. (pet's name, owner's name, phone number) Dimensions: 1.125 Inch diameter (28.58mm) Material: Brass, Silver Plating, and Hard Enamel.