Jardin Fish Tank Air Bubble 2-Piece Air Stone Bars, 8-Inch, Green/Blue Suitable for : Tank, Aquarium; Shaped : Bar Design Material : Mineral, Plastic; Color : Green & Blue Outlet Connector Diameter : 6mm/0.24" (Maximum) Stone Length : 20cm/8" Total Size (Approx.) : 21.2 x 2.1 x 1.3cm/8.3" x 0.8" x 0.5" (L x W x T)