Pawfly Aquarium Air Stone Bar Bubbler 4 Inch, Fish Tank Bubbler Stone with Plastic Base Square Oxygen Diffuser for Nano Air Pump Small Bucket and Fish Tank, 4 Pack

Medium Bubbles: The air stone bars produce an abundant cascade of bubbles which form a rectangle bubble wall, increasing oxygen in your aquarium or fish tank.
Model: ASB100; jetting volume: 1.3 L / min; recommended air pump power: > 2.5 W; standard ID airline tubing: 3/16 inch. Fit for aquariums and tank.
Mineral Material: This air stone is made of natural mineral material with a green plastic base, causing no effect to the health of your lovely fish.
Stable in Water: Each stone measures 4.5 x 0.8 x 0.5 inches (L x W x T) and weighs 1 oz. Its cuboid shape allows it to lie steadier than other shapes in the tank.
Easy to Use: Soak the stone completely in water for 1 hour before use. Clean regularly by a brush as they get clogged after weeks or months of usage.