Uxcell 5-Piece Aquarium Fish Oxygen Cylinder Air Stone Set, 3cm Length Aquarium Air Stone; Suitable for : Aquarium Design : Cylinder; Material : Mineral, Plastic Dimensions(port not included) : 2 x 3cm/0.8" x 1.2"(D*H); Air Tube Port Outer Dia : 5mm/0.2" Main Color : Steel Blue; Net Weight : 75g Package : 5 x Air Stone