Package dimensions 12.3 x 10.8 x 7 cm; 480 grams Medium bubbles: Air stone balls produce dense, abundant bubbles. A great way to increase oxygen solubility in your aquarium and enliven aquatic life Model: ASR-050B; Jet volume: 5 L/min; Recommended air pump power: Standard ID Air Hose: 0.5cm or 0.9cm. Well constructed and efficient for long time service. 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. Stable in water: Each ball is 5cm in diameter and weighs 102g. Well weighted to sink to the bottom and stay stable in your tank for stable bubbles. Easy to use: fully soak stone in water for 1 hour before use. Clean it regularly with a brush because it clogs after weeks or months of use.