This cuttlebone is derived from natural cuttlefish, living world cuttlebone provides natural calcium and minerals that are essential to caged birds. The hard, natural surface keeps beaks trim and sharp. The package includes a cage holder for easy installation. Can be used for parakeets, finches, and canaries. Available in small 5-inch size. Measures 4/5-inch length by 7-inch height by 3-4/5-inch width.