The aluminum mini med alert dog tags are a perfect scaled down version of the original size medical dog tags, measuring 3/4" wide by 1 1/2" long. You can get this ID dog tag engraved with an accessory choice of either a 24" ball chain necklace or a spiral key ring for hooking onto a backpack or keychain! The med alert dog tag is reasonably priced to cover both departments if you choose! N-Style ID does not recommend necklaces for children. View our children's medical ID bracelets.