About this projectAerobic Bubble Oxy Stone is a silent design. It is powered by a pump and makes full use of the power of gas lift. It has no power device and no noise when working. Even if you eep, it will not affect.Bubble stones have a rotatable design. The size and density of the bubbles can be adjusted arbitrarily. Add different effects to your fish tank.The cell plate produces fine air bubbles. Nice bubbles will also make the oxygen replenishment vigorous. It helps increase oxygen, maintains fresh air and creates a healthy environment for fish.Aquarium Oxygenation Bubble Stones can add air flow, circulation to your aquarium, pond, hydroponics and aquaculture to oxygenate the water and benefit aquatic life.The air stone is made of high-quality plastic material, which is sturdy and durable. All finishes are non-toxic, safe and environmentally friendly.2 pieces, size: 32*57mm"