Air Stone Bar: Each airstone measures 8" L x 0.8" W x 0.5" T and weighs 1.9 oz. Well-constructed for continual bubbling. Ideal for fish tanks, DWC systems or aquariums. Medium Bubbles: This air stone produce an abundant cascade of bubbles which form a rectangular bubble wall. Great for increasing oxygen solubility in your aquariums and enliven the aquatic lives. Steady Output: Jetting volume: 2 L/min; Recommended air pump power: > 4 W; Standard ID airline tubing: 3/16 inch. Efficient air bubbler for constant air diffusion. Reliable Material: The air bubblers are made of mineral material and wrapped in a green plastic base, it won't affect the health of your aquatics. Help keep your fish or roots growing healthily. Easy to Use: Soak the air stone completely in water for 1 hour before use. Clean it regularly with a brush as it gets clogged after weeks or months of usage. 8 Inch Blue Air Stone Bars Compressed with sand, the 8 inch air stone bars feature durability, steady medium bubbles and high dissolved oxygen rate. A necessity to aerate your water reservoirs and enliven your aquatic life. It is well built to keep stable in water and withstand long-time use. Perfect for both fresh and salty water like tanks, aquariums and hydroponics. Come with 4 suction cups for organizing hoses and keeping your tanks neat.