Can easily drive even Nano Air pumps, suitable for fish tanks, fish tanks. MODEL: ASR-020. Spray 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: 20mm. Net weight: 120g. Soak the stone completely in water approximately 1 hour before use. Comes with 10 Ball air stones. Spherical Air Stone An airstone, the purpose of which is to gradually diffuse air into the tank and supply oxygen to the breathing fish, a necessity if you are an aquatic animal lover.UnicLife air cones are made from high quality non-toxic mineral materials. With high temperature sintering, the stones are sturdy and durable, have high dissolved oxygen, and create even and tiny bubbles rather than a limited number of large ones. Made of mineral material of high quality and harmless Create small bubbles rather than bigger ones Keep supplying oxygen for your fish to breathe What kind of Airstone should I use? Let's clarify the basics: A larger air stone requires a more powerful pump to produce more bubbles. Basically , larger air stones can produce more nice 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 the front of the 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 in the form of a globe, a disc or even a cube. Cylinder shapes can come in many sizes and colors. Disc shapes can stay stable at the bottom of your tank, while globe shapes can produce more bubbles of the same size. Note: Data is manual measurement, please allow 1-171cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.