This fish tank Air Stone Bubbler is made of high grade wood material for durable and use. This wood bubbler is used with your protein skimmer, designed to add oxygen to fish tank water. And the fish tank Air Stone is suitable for hydroponic systems, , aquariums, fish tanks and other systems. Features -Color:Light Yellow -Material:Wood -Size:6.50X2.30X2.20cm/2.55X0.90X0.86in - Adopted of , it is practical and durable, excellent and reliable with . - Increases air flow circulation to oxygenate water that is beneficial to fish tank, useful and reliable. - Lightweight and compact size, easy to operate. Simple and delicate appearance, simple and stylish. - The wooden Air Stone is uniform, small and dense, with good oxygenation effect, useful and practical for you - A great and simple way to add oxygen to your protein skimmer, aquarium, fish tank, hydroponic and circulation system. Package list: 2 x Wooden Air Stones