Higgins Mineral Grit for all small birds including Canaries, Finches, and Parakeets, is a great source of calcium and minerals. Mineral Grit is made with crushed oyster shells and not gravel. The oyster shells are enriched with essential minerals that give its unique color and natural anise oil for a pleasing, licorice aroma. Mineral Grit is free of artificial colors, flavors or preservatives.