Package dimensions 12 x 11.3 x 2 cm; 120 grams Medium bubbles: The air stone disc produces dense and abundant bubbles. A great way to increase oxygen solubility in your aquarium and enliven aquatic life. Model: ASD-040; Jet volume: 2 L/min; Recommended air pump power: 2W - 4W; Standard air tube ID: 0.5 cm. Suitable for use in aquariums, fish tanks, and small ponds. Reliable material: Made of mineral material and sintered at high temperature. Ideal for aeration in a DWC tank. Helps maintain healthy fish or root growth. Stable in water: Each disc measures 4D x 1.8H (cm) and weighs 28.3 g. Its round, flat shape allows it to always sink to the bottom and sit securely in the tank. Easy to use: Soak the stone completely in water for 1 hour before use. Clean it regularly with a brush because it clogs after weeks or months of use.