This is our small ball lettuce coral measuring 4x4x3.5 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. Pictured here is the standard lime green. 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