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 bulk quantity and 6-7-inch size. Measures 23-inch length by 15-inch height by 14-1/2-inch width.