Assortment pack, includes 3 red, 3 blue, 3 green, and 3 orange. Perfect for jobs like tail chalking for heat detection, sow breeding,animal health management, sorting, inoculating and much more. This non-toxic marker is safe for you and your animals. They go on wet or dry animals and leave a smooth mark that consistently resists fading and smearing. For use with healthcare and reproduction protocols. Made in USA. Measures 1" diameter by 4" length.