Tiny but Enduring: Each air stone measures 0.6" D x 1" H and weighs 0.3 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-025; Jetting volume: 0.8 L/min; Standard ID airline tubing: 3/16". Driven by even nano air pumps of 2 W - 4 W. Efficient bubble stone for long-time service. Reliable Material: The fish tank air stones are made of mineral material and sintered at a high temperature, 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. The 1 inch air stone cylinders feature durability, steady bubbles and high dissolved oxygen rate. Optimal for aerating your water reservoirs and livening up your aquatics. A necessity to have in the house of aquatic lovers.