(Allflex) Allflex Swine FDX EID Tags are tamperproof, single-use tags that utilize Full Duplex Technology. Each tag is printed with the unique ID number that is stored within the tag's FDX transponder. Tags can be visually verified with printed tag ID number or automatically verified with use of a reading device. Allflex Swine FDX EID Tags are made from rigid plastic with a tamperproof cap. Includes Global extended male buttons for deeper placement within the ear. Apply with Allflex Universal Total Tagger (remove the clip) or Allflex Retractomatic. 1.04" dia x 0.25" thick.