Can easily drive even Nano air pumps, suitable for aquariums, fish tanks. MODEL: ASR-020. Nozzle volume: 1L/min, recommended air pump power: 2W-4W. Made of high quality non-toxic mineral material. Suitable for pipes with an internal diameter of 4 mm. Compact diameter: 20 mm. Net weight: 120g. Soak the stone completely in water for about 1 hour before use. Comes with 10 Airball Stones. Spherical Air Stone An Airstone whose purpose is to gradually disperse the air in the tank and provide oxygen to the breathing fish, a necessity if you are an aquatic animal lover. 39;air UnicLife are made from high quality non-toxic minerals. With high temperature sintering, the stones are strong and durable, have high levels of dissolved oxygen, and produce uniform tiny bubbles instead of a limited number of large bubbles. Made of mineral material high quality and harmless Create small bubbles instead of bigger ones Allow your fish to breathe oxygen What kind of stone to air stone should I use Let's get the basics straight: A larger air stone requires a more powerful pump to produce more bubbles. Basically , larger air stones can produce more beautiful bubbles and are used for powerful air pumps. If you connect a larger air stone to a small pump, the bubbles will only be created on the front stone. Small pumps go well with small air stones, while powerful pumps and small stones do not mix well. About shapes The most common form of this device is the cylinder, but you can also find it in the form of a sphere, a disc or even a cube. Cylindrical shapes can be of many sizes and colors. Disc shapes can stay stable at the bottom of your tank, while globe bubbles can produce more bubbles of the same size.