This is the medium version of our closed brain coral measuring 5x3.5x2.25 inches. These are made of a durable, flexible and nearly unbreakable UV stable polyurethane composite safe for all aquariums. Many colors to choose from. See our website for more pictures and full coral catalog at www.oceanaquaria.com Thank You and enjoy the finest artificial corals ! Call or email us anytime with any questions at 1-888-637-6598 or oceanaquaria@gmail.com