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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:random Material: Resin Size: 16.5*11.5*6.5cm Suitable for inner diameter 4mm soft tube Quantity:1Pc Package includes(no retail package): 1Pc x air bubble stone (no tubes)