It is adjustable and can increase the air of your fish tank. It is small, space savings, it can be set at any place of the tank. Work together with an air pump(not included), make no noise.
Brand Name: OOTDTY
Size: One Size - Air Bubble Ball Diameter: 1.7cm (0.67in) Sucker Diameter: 2.7cm ( 1.06in) Color：As pictures show Package includes: 1Pc x Air Bubble
Model Number: Decorations & Ornaments
Aquatic Decorations Type: Ornaments