Shrinky Dinks are back! Only this time they're serving a very practical purpose. FasTags are pet ID tags that use the Shrinky Dink technology that kids have had fun with for years. Use a permanent marking pen to write your cat's name, address and phone number on the floppy plastic tag, then pop it in the oven for five minutes to shrink it down to a hard density. The manufacturer says the lettering is covered with a protective adhesive so it won't rub off. There are several adorable kitty designs to choose from.