BioLogicís BioRock delivers a readily available mix of all-natural minerals. Over 50 to be exact. Many of them vital to antler growth and overall health like calcium, phosphorus, magnesium and sulfur. Simply set BioRock out on a stump or level, well-drained surface near an area of high deer traffic and let it work its magic. Perfect for hunting, observation for trail cameras or helping your heard reach their maximum health and antler growth. CANNOT SHIP TO PO BOXES. PLEASE PROVIDE STREET ADDRESS AND PHONE NUMBER.