Bubble Stone Fish Tank Pump Hydroponic Oxygen Plate Mini Aquarium Accessories C Features: Practical and durable home using product 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 Easy and convenient to use. Perfect accessories for better life Size:C: Diameter 3.15”/ 8cm Material: Natural sand + Plastic Color: As picture NOTE: The stone only blister when connected to a pump. Please immerse the product in water for 15 minutes before use Package Included: 1 x Air Stone Bubble Stone Fish Tank Pump Hydroponic Oxygen Plate Mini Aquarium Accessories CFeatures:Practical and durable home using productIncrease 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 scenesEasy and convenient to use.Perfect accessories for better lifeSize:C: Diameter 3.15”/ 8cmMaterial: Natural sand + PlasticColor: As pictureNOTE: The stone only blister when connected to a pump.Please immerse the product in water for 15 minutes before usePackage Included:1 x Air Stone