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. Note: The data are all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.