Can easily drive even Nano Air pumps, suitable for aquariums, fish tanks. MODEL: ASR-020. Jet volume: 1L/min, Recommended air pump power: 2W-4W. Made of high quality non-toxic mineral material. Suitable for 4mm inner diameter tube. Compact diameter: 20 mm. Net weight: 120g. Soak the stone completely in water about 1 hour before use. Comes with 10 Air Ball stones. Spherical Air Stone An airstone, the purpose of which is to gradually diffuse air into the tank and provide oxygen to the breathing fish, a necessity if you are an aquatic animal lover. 39;air UnicLife are made from materials high quality non-toxic minerals. With high temperature sintering, the stones are strong and durable, have high dissolved oxygen, and create uniform, tiny bubbles rather than a limited number of large ones. Made of high quality and harmless mineral material Create small bubbles instead of bigger ones Keep supplying oxygen for your fish to breathe What kind of Airstone should I use Let's clarify basic knowledge: A larger air stone requires a more powerful pump to produce more bubbles. Basically, larger air stones can produce nicer bubbles and are used for powerful air pumps. If you connect a larger air stone to a small pump, the bubbles will only be produced on thein front of stone. Small pumps go well with small air stones while powerful pumps and small stones do not get along well. About shapes The most common shape of this device is the cylinder, but you can also find it as a globe, disc, or even a cube. Cylinder shapes can come in many sizes and colors. The shapes of the discs canstay stable at the bottom of your tank, while the globe ones can produce more bubbles of the same size.