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Decription: Star Shape Air Stone Bubble Aquarium Fish Tank Hydroponics Aerator Diffuser Increase oxygen levels, reduce CO2 and raise PH. Creates water currents and dazzling underwater scenes. Suitable for ponds, aquarium and fish tank.Ideal for aquarium air pump. Durable, washable and sintered by high temperature, different from other air stones. Specification: Color: Random Material: Stone Size: 8.5cm/3.35inch (width) 8.5cm/3.35inch (length) Total Length: 10cm/3.94 inch Diameter of waterpipe joint: 3mm/0.11inch Package includes: 1x Air Stone