Ketchum Pet License Tags (rabies tags) are produced using 0.040” plain aluminum or 0.050” coloured aluminum (blue, red, green). This shape is also available in a brass or stainless steel material. There are different packaging options available to you with our Pet License Tags 1. Tags strung on a wire in lots of 50 with/without attachments supplied separately. 2. Tags with either S-hooks or O-rings attached and strung on a wire in lots of 25. 3. Tags polybagged with either S-hooks or O-rings in a continuous strip.