Uxcell Aquarium Oxygen Circulate Flexible Pipe Tube, 15.5m, Clear Product Name : Aquarium Oxygen Tube; Color : Clear Material : Soft Silicone; Total Length : 15.5M/50.9ft Internal Diameter : 4mm/0.15"; External Diameter : 6mm/0.23" Weight : 223g Package Contents : 1 &times; Aquarium Oxygen Tube