This Air Stone is made of safe materials and is durable. Designed to add oxygen and circulating nutrients to your hydroponic growth system or aquarium. It is suitable for hydroponic systems, ponds, aquariums, fish tanks and other systems. Features -Color:As shown. -Material:Nano -Size:20.00X3.70X1.00cm/7.86X1.45X0.39in -This Air Stone has capacity for repeatedly producing a lot of small and tiny bubbles. -It can repeatedly diffuse fine and uniform bubbles, with rapid aeration. You can send it as a present for your friends who raise fish, give them a little . -Fish tank stone with performance. Good for maintaining the health of your pet , make their daily life happier. -The material of choice is undoubtedly good material, safe, durable and practical. -The excellent workmanship of our products will bring you a good user experience. Package list: 1 × fish tank bubble stone 1 × suction cup