Features:100% Brand new and high qualityPractical and durable home using productIncrease 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. Specifications:Color: As picture Material: Plastic Item Shape: VolcanoItem Size: Approx. 165mm * 115mm (D * H) Item Weight: Approx. 80g Package include: Only 1*air bubble stone (no tubes)Suitable for inner diameter 4mm soft tube Notice:The rockery can be used as landscape for your fish tank. You also could put pump oxygen Shatou into the volcano, showing the effect of the bubble.-Due to production batches are different, there might be slight difference on appearance color, Please place order carefully if you mind this point. Quantity: 1pc Note: Manual measurement, there may be 1-2cm/1-3g error, which is not a quality problem. Due to different screen displays, there may be a color difference between the real object and the picture, and the main picture shall prevail.