Ani-Logics Ani-Block gives your deer what nature doesn't always provide. It offers key vitamins and chelated minerals like Copper, Zinc, Selenium and Manganese. Formulated with Anilogic's exclusive, proprietary Ani-Shield TX4 technology, Ani-Block is designed to support the immune system and antler growth. Easy to use, just set it and forget it. FeaturesAni-Shield TX4 designed for whitetail deer antler growth and promotes healthProprietary whitetail deer attractant Formulated with vitamins and chelated mineralsConvenient 20 pound blocks