Medium Bubbles: The air stones with micro holes generate abundant dense bubbles around the cylinders, increasing oxygen levels and supporting aquatic life in your tank. Model: ASC100; Jetting volume: 5 L/min; Recommended air pump power: > 7 W; Compatible with standard 5mm ID tubing. Made from durable and washable silicon carbide. Larger Size: These bubblers are 10 cm in length and 5 cm in diameter, suitable for various applications such as hydroponic systems, ponds, aquariums, and fish tanks. Stable in Water: Each cylinder weighs 0.36 kg, allowing it to rest or stand securely at the bottom of the tank during operation, ensuring consistent bubble distribution. Easy to Use: Soak the air stone fully in water for one hour before initial use. Clean with a brush when clogged after extended use.