Aquarium Volcano Shape & Air Bubble Stone Oxygen Pump Fish Tank Ornament Decor Description: 100% brand new and high quality 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. Creates bubbles in fish tank while attached to an air pump(air pump is not included). Creates water currents and dazzling underwater scenes. Perfect accessories for better life Green resin, non-toxic, safe for use Specifications: Color: As picture Material: Resin Size L: 16*5*11cm (L x W x H) Suitable for inner diameter 4mm soft tube Quantity:1Pc Note: Size for manual measurement, there may be a 0 to 2 cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1Pc x air bubble stone (no tubes)