This is our large barnacle coral measuring 6.5x5x5 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. Pictured here is the purple/white two tone color. All of the neon color options will glow under black light and 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