Combines two great calcium and mineral sources. We drill the cuttlebone and run the mineral block through. The combo is then mounted to your cage using the ties built into the mineral block. Cuttlebone is a great source of calcium for your birds and also helps condition their beaks. Cockatiels just love them and are great for any birds diet. Every bird can have a mineral block. It is good for their beaks and also provides valuable minerals needed by your birds. Breeders and pet owners will both appreciate these blocks. They are not too hard like many of the mass produced blocks. Contains one piece of Small Cuttlebone and one California Calcium Small Unflavored Mineral Block.