Medium Bubbles: The air stone produces dense, abundant bubbles to aerate your water tanks. A great way to increase oxygen solubility in aquariums, fish tanks or ponds. Jet Volume: 15L/min; Recommended Air Pump Power: > 4W; Standard ID Air Tube: 0.5cm or 0.9cm. Ideal for aquariums, DWC systems or ponds. Reliable Material: Made of mineral material and sintered at high temperature, it has no effect on the health of your aquariums. Helps maintain healthy growth of fish or roots. No More Floating: Dimensions: 10 x 3.8cm (D x H) and weighs 328g. And its wide and flat bottom ensures that it always stays stable in the tank to produce more stable bubbles. Easy to use: Before using, fully soak the stone in water for more than 3 hours. Clean it regularly with a brush as it will get clogged after weeks or months of use. Product Description 2 Packs of 10cm Air Stone The 10cm Air Stone stones feature durability, stable bubbles and high dissolved oxygen content. Optimal for aerating your water tanks