uxcell Black 3 Meters 4mm OD 2.5mm ID 0.75mm Wall Thickness PU Air Hose Pipe Product Name : Polyurethane Air Tube;Material : Polyurethane(PU) Outside Diameter : 4mm / 0.157";Inside Diameter : 2.5mm / 0.098" Wall Thickness : 0.75mm / 0.029";Total Length : 3Meter / 9.8Ft Color : Black;Weight : 35g Package Content : 1 x Polyurethane Air Tube