http://www.pbsanimalhealth.com/.../Revolving.../440-215.html I have this one, I like that I don't have to swap out my herd tattoo! So I just change numbers on one side and have my herd tattoo on the other. I also like that it "pushes" the ear off the tattoo plyers when you open it! It's hard enough to be "mean" to the babies without having to manually pry an ear off the evil pointy biting monster! I believe I bought the letters from jeffers? As they were cheaper! definitely shop around!
Natalie M. replied:
Hamby Dairy Supply has a similar kit that includes pretty much everything you need, pliers numbers letters ink and storage box.