Air Bubble Disk Stone Aquarium Aerator Fish Tank Pump Hydroponics Oxygen 40mm Description : It produces fine bubbles making it efficient in the replacement of Oxygen in fish ponds, tanks or hydroponic systems. A great way to properly aerate a home aquarium. It creates a circle of bubbles that helps keep healthy fish and adds to the beauty of the aquarium. Dimensions: Total length: 2.125 inches (including the air stone and nozzle) Dimension of the air stone: 1.5" in diameter x 0.5"H INCLUDES: 1 piece of air stone disk