Long Air Stone Bar: Each airstone measures 12" L x 0.8" W x 0.5" T and weighs 3 oz. Well-constructed for continual bubbling. Ideal for medium or large fish tanks, DWC systems or ponds. 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: 3.3 L/min; Recommended air pump power: 7 W; Standard ID airline tubing: 3/16 inch. Efficient bubblers 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 aquarium 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. 12 Inch Blue Air Stone Bars Compressed with sand, the 12 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.