The Active Aqua Air Stone is a 6" (15 cm) air diffuser/air stone designed for creating oxygen bubbles in water. This 2-pack new in box product by Active Aqua features a blue color and has 1 outlet. The set includes everything needed to efficiently aerate your water, making it ideal for use in various aquarium or hydroponic setups. With its reliable brand reputation and specific size, this air stone is a great addition to any system requiring oxygenation.