This style of reef marble from Aaron is the only one of these I have ever sold and they are SUPER rare. With this one, you not only get the sweet reef down in there, but there are all sorts of other sea creatures swimming around the outside of it - different types of jellyfish, a school of tiny silverfish, etc. You have to turn the marble all around and explore the wonders of the ocean inside (similar to exploring a Recko Universe marble). It is a large and fantastic marble, full of wonder!! The outside features a cobalt foam-tipped wave. This one has been in my collection since I got it from Aaron and it is time to let somebody else enjoy it.