uxcell Aquarium Mineral Bubbles Airstone, 9.3-Inch, Dark Gray Aquarium Colored Air Stone; Suitable for : Fish Tank, Aquarium Air Stone Body Design : Cylinder Shape; Material : Mineral, Plastic, Metal Import Diameter : 5.2mm/ 0.21"; Total Size(Approx.) : 5.2 x 5.2 x 23.5cm / 2.1" x 2.1" x 9.3"(L*W*H) Color : Dark Gray, Black, Silver Tone; Weight : 370g Package : 1 x Aquarium Plastic Air Stone