Quietly Produces Small, Dense Bubbles: This aqua air stone silently forms a very dense cloud of small bubbles.When the air bubbles burst into the water, the sound is even quieter. Create a large number of tiny air bubbles in the fish tank for a dazzling curtain effect.High Dissolved Oxygen: Fine air bubbles increase the rate at which oxygen dissolves in the water, which is a great way to add oxygen, reduce carbon dioxide levels and keep fish healthy.The suction cup tightly absorbs the air stone on the water tank. Durable and perfect for home, office fish tanks, aquariums and hydroponic food tanks.SAFE MATERIALS: This aquarium air stone is reusable for repeated cleaning, long-term use, and safe, non-toxic materials to keep fish healthy and active.Material:ABScolour:As ShownPackage Contents:1 * 12mm air stoneOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.