Tiny but Enduring: Each air stone measures 0.6" D x 1" H and weighs 0.27 oz. Tiny but well-constructed for continual bubbling. Ideal for small fish tanks or aquariums. Medium Bubbles: The air stone cylinders produce a good amount of dense bubbles. A great way to increase oxygen solubility in your aquarium and enliven the aquatic lives. Model: ASC-025B; Jetting volume: 0.8 L/min; Standard ID airline tubing: 3/16". Recommended pump power: 2 W - 4 W. Efficient air bubblers for long-time service. Reliable Material: The fish tank air stone are made of mineral material and built solidly, it causes no effect to the health of your aquatics. Help keep your fish growing healthily. Easy to Use: Soak the airstone completely in water for 1 hour before use. Clean it regularly with a brush as it gets clogged after weeks or months of usage. Oxygen levels in the aquarium water need to be maintained at a level which is high enough for the fish to absorb through their gills. Premium quality cylinder air stone providing oxygen for fish to breathe.