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Bubble Stone -Diameter 4/10/13cm air stone disk suitable for 0.16"/4mm inner diameter tube -Diameter 20cm air stone disk suitable for 0.31"/8mm inner diameter tube -Safe & High Quality Material: The air disk uses finely compressed material so the bubble is small, non-toxic mineral material keeps fish healthy and safe How to Use: To connect to air hose and pump, it can be used longer with good sufficiency if you clean the surface of dispersion tool often Versatile Airstone: Rising bubbles enhance vital hydroponic system aeration & water movement, it helps keep healthy fish and adds to the beauty of the aquarium