Size: 20 * 15cm/ 7.9 * 5.9 inch(L * W); Material: Natural Sea Tree. This is real dried coral, instead of plastic artifical one. It is vividly and color detailed to add lively and natural life to your tank. When you put it into the water, your fish will immediately find a new favorite hiding spot. Change your aquarium into a beautiful scenery.and it is also perfect for DIY Marimo ball aquariums.