DuFlex ear tags are molded from a patented flexible polyurethane for rugged, lightweight tags in bright, fade-resistant colors. Standard numbered ear tags are hot stamped with black ink that is guaranteed for the life of the animal. DuFlex self-piercing studs are specifically angled to create clean, small incisions. Studs are treated with patented Infecta-Guard, to reduce the risk of infection and disease transfer, and to facilitate proper healing. DuFlex ear tags are designed for easy application, superior retention and reliable performance in harsh weather conditions. 4 5/8 inches high x 3 inches wide.