Penn Plax Cuttlebone w/Holder - X-Large for Med. - Lg. Birds IMPORTANT FOR YOUR BIRDS DIET: calcium carbonate and other materials found in cuttlebones are very important for your birds healthy diet. GOOD FOR BEAKS: the rough cuttlebone texture is perfect to keep their beak trimmed and strong. PERFECTLY SIZED: includes a holder to attach the cuttlebone to a wire cage; this cuttlebone is 9 inches tall. SHOP PENN PLAX FOR ALL YOUR PETS NEEDS: Penn Plax creates excellent pet supplies for animals both great and small, at affordable prices.