Made of , this Air Stone is useful and excellent for aquarium and fish tank use, to make fine bubble for increasing oxygen, simple and useful, quiet and . Wonderful workmanship, durable and useful, simple and stylish appearance, perfect for home and office use. Features -Color:Multi -Material:Acrylic -Size:7.50X7.00X4.30cm/2.95X2.75X1.69in - 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. - A great and simple way to add oxygen to your aquarium, fish tank, hydroponic and circulation system. - The Air Stone is uniform, small and dense, with good oxygenation effect, useful and practical for you. Package list: 3 x Air Bubbler Disc 3 x Regulator