Ohko stone, also known as "Dragon Stone" is sought the world over by aquarium enthusiasts. The textured surfaces of the rock are aesthetically appealing with color varying from brown, to green, to even hints of red occasionally. You will receive 10lbs of stone. Each order contains one larger stone, about 3 to 6 lbs., plus a variety of smaller stones to make up the full 10lbs. Please see the second picture for a representative sample. Each order is different, as nature makes only one of each stone. As Ohko stone is basically dried clay, it recommended to wash and soak the stone for a couple of days before use. Since it is clay based, Ohko stone can be broken to create smaller pieces with a hammer and chisel. It will also help purify the water in your aquarium and create a more natural environment for your fish.