Medium Bubbles: The air stone produces abundant dense bubbles to aerate your water reservoirs. A great way to increase oxygen solubility in fish tanks, aquariums or ponds. Model: ASR-060; Jetting volume: 12 L/min; Recommended air pump power: > 4 W; Standard ID airline tubing: 0.5cm. Great for aquariums, DWC systems or small ponds. Reliable Material: Made of mineral material and sintered at a high temperature, it causes no effect to the health of your aquatics. Help keep fish or roots growing healthily. No More Floating: Measures 6 D x 3H(cm) and weighs 108g And its wide and flat bottom always keeps it sitting stably in the tank to produce steadier bubbles. Easy to Use: Soak the stone completely in water for more than 1 hour before use. Clean it regularly with a brush as it gets clogged after weeks or months of usage.