Uxcell Mineral Bubbles Aquarium Air Stone, 8.3-Inch Diameter, Dark Gray Product Name : Aquarium Bubbles Air Stone; Fit for : Fish Tank, Aquarium Material : Mineral, Plastic, Metal; Color : Dark Gray, Black, Silver Tone Shape : Round; Air Stone Size(excluded connector) : 21.2 x 3.5cm/8.3" x 1.4"(D*H) Fit Air Tube : 8.8mm/11/32"( 0.35"); Total Length : 24.3cm/9.6" Weight : 1020g; Package Contents : 1 x Aquarium Air stone