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. An airstone, whose purpose is to gradually diffuse air into the tank and provide oxygen for fish to breathe, is an necessity to have around your house if your are a lover of aquatic animals.Pawfly air stones are made of high quality non-toxic mineral material. With high temperature sintering, the stones are sturdy and durable, have high dissolved oxygen rate and create even and tiny bubbles rather than a limited number of large ones.