Check the listing for details. 5x 2cm Fish Tank Aerator Mineral Bubble Release Aquarium Air Stone Diffuser YM0. Condition: New, Made in China. Listed at 13.71 USD. 5Pcs 2cm Fish Tank Aerator Mineral Bubble Release Aquarium Air Stone Diffuser soak in water for 15 minutes before use. suitable for inner diameter 3mm-4mm soft tube Package includes: 5x air stone Material: ore Color: random Dia: 2 cm/0.78 in Features: *Ozone aerated stone, bubble stone, using super hard gold steel sand, after high-temperature sintering, good gas diffusion, good filterability, ozone resistance, corrosion. *Increase oxygen levels, lower CO2 and raise PH, creates water currents *It is an important instrument to successfully keep aquatic fish for the respiration process. *Durable can be reused and washed repeatedly. *Creates bubbles in a fish tank while attached to an air pump(air pump and air tube are not included). SKU: 238-186 Happy shopping. Th.