Jardin 2-in-1 Fish Tank Aquarium Bubble Wall Air Stone Tube Set, 12-Inch Long, Blue Bubble Wall Air Stone Tube; Suitable for: Fish Tank, Aquarium Fit for Aquarium Oxygen Pipe External Dia.: 6mm/0.24";Design: Tube Shaped Material: Plastic, Rubber; Tube Size(Jointed): 30.5 x 1cm/12" x 0.39" (L*D) Color: Blue; Weight: 35g Package Content: 2 in 1 x Bubble Wall Air Stone Tube