Designed to provide additional calcium and other important minerals for birds on a seed-based diet. Ingredients: Granite Grit, Oyster Shell, Calcium Carbonate, Dicalcium Phosphate, Salt, Charcoal, Mineral Oil, Orange Oil, Zinc Oxide, Manganous Oxide, Ferrous Carbonate, Copper Oxide, Calcium Iodate, Cobalt Carbonate.