Sorry, I meant a normal little circular metal tag that they give you at the vets when you have your cat chipped. It says "Scan me" on one side. It's blue coloured for a standard chip and red for the Bio chip (the one they can scan to tell your cat's temperature any time it's poorly without sticking a thermometer up its bum). Unfortunately they only give you one tag, not a little stash of them. Bertie's at the vets being neutered right now, so as he tends to lose his collars during the night I'm hoping he'll be more homeloving and get up to less mischief with his collars.