New Pro Air Bubble Stone Aerator Aquarium Fish Tank Pond Pump Hydroponic Oxygen Description: 100% brand new and high quality Quantity:2pcs Increase oxygen levels, lower CO2 and raise pH It is an important instrument to successfully keep aquatic fish for respiration process Durable, washable and sintered by high temperature, different from other air stones Creates bubbles in fish tank while attached to an air pump Creates water currents and dazzling underwater scenes Size: Approx. 40mm x15mm (D*H) Material: Mineral stone + Plastic Color: Gray Weight: Approx 28g Suitable for inner diameter 4mm soft tube, If you need, please contact us Easy and convenient to use Package included: 2 x Air Stone (Without retailing packing) New Pro Air Bubble Stone Aerator Aquarium Fish Tank Pond Pump Hydroponic Oxygen Description:100% brand new and high qualityQuantity:2pcsIncrease oxygen levels, lower CO2 and raise pHIt is an important instrument to successfully keep aquatic fish for respiration processDurable, washable and sintered by high temperature, different from other air stonesCreates bubbles in fish tank while attached to an air pump Creates water currents and dazzling underwater scenesSize: Approx. 40mm x15mm (D*H)Material: Mineral stone + PlasticColor: GrayWeight: Approx 28gSuitable for inner diameter 4mm soft tube, If you need, please contact usEasy and convenient to usePackage included:2 x Air Stone (Without retailing packing)