uxcell Aquarium Mineral Bubbles Air Stone, 3.5-Inch Long, Dark Gray Aquarium Bubbles Air stone; Suitable for : Fish Tank, Aquarium Design : Cylinder Shaped; Material : Mineral, Plastic Fit Air Tube : 3mm/0.1";Air Stone Size(excluded connector) : 70 x 16mm/2.8" x 0.6"(H*D) Total Length : 90mm/3.5";Color : Dark Gray, Black Weight : 22g;Packag : 1 x Aquarium Bubbles Air stone