Medium Bubbles: The air stone produces dense and abundant bubbles to aerate your water tanks. A great way to increase oxygen solubility in aquariums, fish tanks, or ponds. Jet Volume: 15 L/min; Recommended Air Pump Power: > 4 W; Standard ID Air Tubing: 0.5 cm or 0.9 cm. Ideal for aquariums, DWC systems, or ponds. Reliable Material: Made of mineral material and sintered at high temperature, it does not cause any health effects to your aquatics. Helps maintain the healthy growth of fish or roots. No More Floating: Measures 10 D x 3.8 H (cm) and weighs 328 g. And its wide and flat bottom always keeps it stable in the tank to produce more stable bubbles. Easy to use: Fully soak the stone in water for more than 3 hours before use. Clean it regularly with a brush because it gets clogged after weeks or months of use. Product Description 2 packs of 10cm air stones The 10cm air stones feature durability, stable bubbles and high dissolved oxygen. Optimal for aerating your water tanks and