Zoo Med Turtle Bone Supplement is a natural floating source of calcium for all species of aquatic and terrestrial turtles and tortoises. Turtle Bone provides habitat enrichment and supplementary calcium on an "as needed" basis. Extra calcium is important for juvenile turtles for shell growth as well as gravid turtles and tortoises for egg development. The rough edible surface helps prevent overgrown beaks as well as curb unwanted chewing behavior. There are two cuttlebones per package.