Size: 3~4cm Provides natural calcium and mineralsDerived from natural cuttlefish.Natural surface keeps beaks trim and sharpSuitable for cockatiels Material: Cuttlefish bone The cuttlebones can also be cut into smaller pieces or ground into a powder and used as a nutritional supplement for all types of birds. Cuttlebones are an excellent calcium source for birds. The rough edible surface helps to trim the beaks of birds as well as provide something for your bird to chew on.