Medium Bubbles: The air stone sticks create an abundant cascade of bubbles that form a rectangular wall of bubbles, increasing the oxygen in your aquarium or aquarium.^ Model: ASB100; Jet volume: 1.3 l / min; Recommended air pump power:> 2.5 W; Standard ID Airline Tubing: 3/16 "Suitable for aquariums and aquariums.^ Mineral Material: This air stone is made of natural mineral material with a green plastic base, which does not affect the health of your beautiful fish.^ Stable in water: each stone measures 11.4 x 2.0 x 1.3 cm (L x W x D) and weighs 28.3 g. Its cuboid shape allows you to lie more stable than other shapes in the aquarium.^ Easy to use: soak the stone completely in water for 1 hour before use. Clean with a brush regularly as they will clog after weeks or months of use.