Standard model: holds five 5/16" digits. Kit includes tattooer, ink and number set. This particular size is favored by sheep producers. Positive ear release. Individual letters or numbers sold Here...https://heritageanimalhealth.com/sheep-goat/13030-stone-tattoo-digits-individual-letters-or-numbers-516.html
You can purchase a kit, individual letters, individual numbers, alphabet or number set. If purchasing an individual number or letter please specify in the comment box which one you would like.