Why do you need Air Stone Bubble? Aquarium Air Stone allow the aquarium to create beautiful walls of bubbles that not only look good, but also help aerate and circulate the water. Made with High Quality material. This air disk uses finely compressed material so the bubble is small. The disk is encased in a heavy duty plastic so the air bubble is concentrated at one surface. producing a evenly distributed bubble wall. Simply connect the disk to air pump and place the disk in the water. The porous carborundum stone will produce a cylinder of fine bubbles which effectively oxygenate the water for your fish. Packing List: 1 * Aquarium Air Stone.