["brand new and high quality \r\nFeatures:\r\nA great way to properly aerate a home aquarium, help to keep fish healthy and adds to the beauty of the aquarium.\r\nIncrease oxygen levels, lower CO2 and raise pH\r\nIt is an important instrument to successfully keep aquatic fish for respiration process\r\nDurable, washable and sintered by high temperature, different from other air stones\r\nCreates bubbles in fish for tank while attached to an air pump\r\nCreates water currents and dazzling underwater scenes\r\nEasy and convenient to use.\r\n\r\nUsage: \r\nBefore use, please immerse it in the water for 15 minutes. \r\nAfter a long-term use, clean your stone regularly so that it will be most effective. \r\nIf the air stones just have bubbles in one part, please change a pump of higher power.\r\n\r\nSpecification:\r\nSuitable for inner diameter 4mm soft tube.\r\nMaterial: Mineral, Plastic\r\nDiameter: app.2.2cm/0.87in\r\nHeight: app.4.7cm/1.85in\r\nColor: Blue\r\nQuantity: 1 Pc\r\nNote: 1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.\r\n 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n\r\nPackage includes:\r\n1 x Aquarium Air Stone (without retail package)"]