Air Stone Bar: Each airstone measures 4.5" L x 0.8" W x 0.5" T and weighs 1 oz. Well-constructed for continual bubbling. Ideal for small buckets, fish tanks or aquariums. Medium Bubbles: This air stone can produce a cascade of dense bubbles which form a rectangular bubble wall. Great for increasing oxygen solubility in your aquariums and enliven the aquatic lives. Steady Output: Jetting volume: 1.3 L/min; Recommended air pump power: > 2.5 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. ur 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. Creates bubbles in fish tank while attached to an air pump. It is an important instrument to successfully keep aquatic fish for respiration process. Used to increase the dissolved O2 level in the aquarium.