Select your color and the option of a keychain or a necklace. The necklace is a 24" ball chain style necklace. *Please note the purple color is more of a neon purple, and not as lavender looking as the pictures show., as well as the gold appears more of a stainless color in the pictures. These are great for backpacks, zipper pulls on jackets, or as a necklace when travelling on vacation or out in public. Enter your engraving at checkout in the Notes to Seller. Each dog tag is made from anodized aluminum. They are lightweight, and laser engraved for permanent etching. Each tag measures 2" X 1.25". The information side can be customized with the appropriate information for your child or any adult with allergies. If you have any customization questions, please contact us prior to purchase. Dog Tags ship within 2 business days. If you are looking for bulk quantities, please contact us for pricing.