This sponge measures 2x2x4 inches. can be done in any color, even flourescent glow in the dark colors. Pictured is the standard color blue.. 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