Material: calcium, safe and health. SIZE: 188.8.131.52" (13.3 5.5 5.5 cm) Rugged stone pumice helps clean birds beak, attached bell is great for mental stimulation. Fun to rest and grind, relieves boredom and increases activity level. Easily hooks on to cage for convenient use. Suitable for Parakeets, budgies, ferrets, rat, hamster, squirrel, chinchillas and other small furry animals.