The ATag™ Calf is designed for long term application as a one piece option. It is self-piercing with a pinhole tip, which means faster healing and reduced animal stress. The ATag™ Calf has high retention, especially in thick eared animals due to a longer tag anchor. It also has a large surface area allowing for a wide range of marking options. ATags fit the ATag™ One-Piece Applicator (yellow).