Twigo Tags are fun and easy to use. Personalises instantly: Simply write, boil and wear. Self Attaches to collar. Eliminates jingling and jangling. Made from a durable, lightweight material can withstand the elements of mud, rain, moving water or any environment your pet may explore. Attaches easily and securely with no fussy split ring. Great for everyday use, travel, pet sitters, allergies and indoor collars.