This is a really cool mini brain coral excellent for nano tanks. It measures 1.75x1.75x1 inches high. These are made of a durable, flexible and nearly unbreakable UV stable polyurethane composite safe for all aquariums. Many colors to choose from. 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