Choose from round (1" in diameter) or square (1.25"). The tags are sterling silver plated over bronze. The name and contact image is protected by a thick layer of resin. This also makes the tag completely waterproof.This item is customizable and your pet's name and your contact information can be added at no additional cost. Please supply pet's name and any additional contact information you would like to appear on the tag.Up to 2 lines of contact info can be included beneath your pet's name.These tags also make great ID tags for childrens' clothing or backpacks, as well as stethoscope ID tags for those in the medical profession.A 12mm split ring is included to attach the tag to the collar ring.Please let me know if you have any questions.Thanks!