Aquascaping Stone OHKO Stone The Ohko stone, Aquarium Rocks (Dragon Stone) is a rock that resembles dragon scales. It typically has a greenish brown coloring and is very light weight compared to other hardscape stones. Pre Selected Premium show size stone with an estimate of Stone size,and Stone shape. Pictures are for references only. We will do the best to pick a mixture of sizes in each order For this product listing you are getting 1 Large Show Pieces 7" - 10" Large stone is large and heavy Pictures are for references only, Ohko stone are brown in color and need a good wash before used.