Item Type: Aquarium Air Refiner Material: Acrylic Size: Total Height: Approx. 7cm/2.8in Suction Cup Diameter: Approx. 2.5cm/1.0in Disc Diameter: Approx. 8.5cm/3.3in Total Length: Approx. 11cm/4.3in Disc Height: Approx. 3cm/1.2in Connecting Air Tube: Approx. 4mm/0.16in 1,High Temperature Sintering: High temperature sintered white corundum sand is stronger and more durable, breathable, long lasting use without damage. 2,Double Suction Cups: This aquarium air stone disc is designed with double suction cups, not easy to fall off, firm and durable. 3,Small and Clear: Aquarium air refiner is exquisite and small, does not take up space in the tank, clear, can be integrated with the aquatic plants. 4,Adjustable Air Volume: Nano bubble stone air refiner has an adjustable valve to adjust the air volume. Operates at less than 20 decibels. 5,High Dissolved Oxygen: Fish tank air stone disc has high dissolved oxygen, avoid splashing and very low vibration to the water body.Please allow some errors due to manual measurement.1 x Aquarium Air Refiner 1 x Regulating Valve 2 x Suction Cups Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.