Features1High-temperature sintered air stone is made of high-temperature sintering, which is different from the general commercial air stone. 2The durable air stone can disperse water in any direction to form a beautiful underwater scene. 3Increase surface agitation. 4Accelerate oxygen supplementation and provide other health benefits for fish. 5Help release carbon dioxide accumulation. 6It can be used for a long time and is easy to clean for repeated use. 7Instructions for use: 81. Please use a trachea (not included) to connect the air stone, and connect the other end of the trachea to an air pump (not included). 92. Please soak this product in water for 15 minutes before use. 103. Long-term use, if the dirt is blocked and the bubbles are reduced, it can be taken out for cleaning and used repeatedly.SpecificationMaterial: Sand stone + ABSDiameter: 10cmHeight: 2cmColor: black + grayShape: Disc shapePurpose: Suitable for fish tank size 70-120cmApplicable scope: Applicable diameter is 4mm inner diameter hosePackage List1*Aquariums Oxygen Stone