This professional protein skimmer Air Stone, made of premium and natural wood material, is durable and practical with . This Air Stone is a simple and great way to add oxygen to your protein skimmer and help it decrease protein in the water. Great for fish tank and aquarium use. It will be the for you. Features -Color:Light Yellow -Material:Wood -Size:6.50X2.30X2.20cm/2.55X0.90X0.86in - Made by selected wood material, safe and durable, which could be used for very long time. - Fish tank bubbler Air Stone is useful and reliable, make fine bubble for increasing oxygen. - Simple appearance design and compact size, will not take up much fish tank space. - Wooden air stone can produce very fine, uniform air bubbles, which can greatly dissolve and increase oxygen in water. - A good and practical Air Stone for your protein skimmer, practical and convenient. Package list: 2 x Wooden Air Stones