USDA tags (United States Department of Agriculture) have a unique 15 digit number starting with "840", display the USDA shield emblem and a "Unlawful to Remove" print. A premise ID is required to purchase USDA tags. These are ideal for cattle moving extensively, especially across state lines, and ensure compliance among different states.
Lightweight EID tags are ideal for use with smaller stock. These tags are a bit smaller than the standard EID tags, so do not cause as much weight on smaller ears.