(Allflex) Allflex High Performance HDX Ultra EID Tags are tamperproof, single use tags that utilize Half Duplex Technology. Each tag is printed with the unique 15-digit ID number that is stored within the tag's HDX transponder. Tags can be visually verified with printed tag ID number or automatically verified with use of a reading device. HDX tags are the best choice when tags will be read using a walk-through reader or in a packing plant, because of their greater read distance. Allflex High Performance HDX Ultra EID Tags are made from rigid plastic tag with a tamperproof cap. Includes Global extended male buttons. Apply with Universal Allflex Tagger (remove the clip) or Allflex Retractomatic. 1.18” dia x 0.28 thick.