Medium bubbles: Air stone balls produce dense and abundant bubbles. A great way to increase oxygen solubility in your aquarium and enliven aquatic life.<br> <br> Jet volume: 5 L/min; Recommended air pump power: >4W; Standard ID Air Hose: 0.5cm or 0.9cm. Well constructed and efficient for long time service.<br> <br> Reliable material: made of mineral material and sintered at high temperature. Ideal for aeration in aquariums, DWC systems or ponds. Keep fish or roots healthy<br> <br> Stable in water: Each ball measures 5cm in diameter and weighs 106g. Well weighted to sink to the bottom and sit stably in your tank for stable bubbles.<br> <br> Easy to use: Fully soak the stone in water for 1 hour before use. Clean it regularly with a brush as it becomes clogged after weeks or months of use.<br> <br> Quantity delivered: 2 pieces<br> <br> Product color: blue<br> <br> Product specifications: as shown in the picture.<br> Welcome to meet<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store