Check the listing for details. 10X Air Bubble Disk Stone Aquarium Aerator Fish Tank Pump Hydroponics Oxygen. Condition: New. Listed at 11.99 USD. Features: 100% brand new and high quality. 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.It is an important instrument to successfully keep aquatic fish for respiration process. Durable, washable and sintered by high temperature. Creates bubbles in fish tank while attached to an air pump(air pump is not included). Creates water currents and dazzling underwater scenes. Specifications: Color: Gray Material: Mineral Stone + Plastic Item Weight: Approx. 16g eachNote: Suitable for inner diameter 4mm soft tube. Before use, please immerse it in the water for 15 minutes. It it doesn't have bubbles in one part, please change the pump of higher power. Package: 10 X Air Stone