uxcell Soft Plastic Oxygen Balance Fish Tank Hose Pipe Tube, 5-Meter, Black Aquarium Oxygen Tube; Color : Black Material : Soft Plastic; Total Length : 5M/16.4Ft Internal Diameter : 4mm/0.15";External Diameter : 5mm/0.2" Weight : 71g Package Contents : 1 &times; Aquarium Oxygen Tube