(Allflex) Using 840 series USDA tags gives you compliance with the USDA Country of Origin Label (COOL) laws. These tags signify to buyers that the animals were born in the USA. Unique ID numbers are stored in and printed on each single use, tamperproof Full-Duplex (FDX) tag. Your farm premise ID number is assigned to the tag number series being shipped to you, and the information is held in the NAIS database. Each tag can be visually verified by looking at the printed tag ID number or be automatically verified with use of a reading device. Apply with Universal Allflex Tagger (remove the clip) or Allflex Retractomatic. Please provide your premise ID number, farm name and complete address when ordering. Yellow.