This is our Large groovy brain coral measuring 8x8x3.5 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. All neon colors will glow under black light and most actinic led lights!! 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