Individual Letters for the Ketchum Model 50D Ear Tattooers. Characters are a needle point style and 3/16" tall. Proven over decades of use. Characters specifically designed to produce easy to read tattoo.
The 50D model is the most popular tattooer for tattooing new born pigs (from birth to 3 days of age), dogs, cats, rabbits and other small animals. Character size: 50D-4mm (3/16"), 101-6mm (1/4"). Lock-bar style provides fast and easy tattoo character change and removal. Comfort grip for easy long term use.
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http://livesotckconcepts.com/cataloguploads/Ketchumtattoo-Directions.pdf