uxcell Fish Tank Air Bubble Release Air Stone Bar, 20cm, Green/Blue Aquarium Air Stone; Suitable for : Tank, Aquarium Shaped : Bar Design; Material : Mineral, Plastic Outlet Connector Diameter : 4mm/0.15";Stone Length : 20cm/7.9" Total Size (Approx.) : 21.3 x 2.2 x 1.3cm/8.4" x 0.9" x 0.5" (L*W*T);Color : Green, Blue Weight : 54g;Packag : 1 x Aquarium Air Stone