Product information: Material: PC Color: white + transparent Type: Y35, Y60 Diameter: Approx. 3.5cm/1.38", 6cm/2.36" Height: Approx. 7 cm / 2.75 inches Features: Quietly produces small, dense bubbles: This aquarium air stone quietly produces a very dense cloud of small bubbles. When the air bubbles burst into the water, the sound is even quieter. Create a lot of thin air bubbles in the fish tank for a dazzling curtain effect. High Dissolved Oxygen: The fine air bubbles produced increase the oxygen dissolution rate in the water, which is a great way to add oxygen, reduce carbon dioxide levels and keep fish healthy. Easy to use: 2 suction cups make the air stone firmly adhere to the water tank. Durable and perfect for home, office fish tanks, aquariums and hydroponic nutrient tanks. SAFE MATERIAL: This aquarium air stone can be washed repeatedly for long-term use, and the safe, non-toxic material keeps fish healthy and active. COMPACT SIZE: Air stone can be easily taken out of sight and save space due to its slim, compact design. Packing list: 1 pc* air refiner