If removed it cannot be used again. Ketchum normally allocate the code letters and consecutive numbering for these ear tags, and Guarantee never to duplicate letters and numbers. A careful record is kept of all tags sold, with the name and address of the Breeder supplied. Totally tamperproof and so simple to apply. One swift action. Placed in our special pliers the tag is quickly inserted through the leading edge of the ear, preferably close to the head. Leave room to grow! Manipulate the pliers with a quick steady squeeze, without pulling. Alternative specially lettered and numbered tags available.