4mm OD x 2.5mm ID PU Pneumatic Air Tubing Pipe Hose 6M 20ft Red Product Name : PU AirTubing;Material : Polyurethane(PU) OuterDia (OD) : 4mm/ 0.16";InnerDia (ID) : 2.5mm/ 0.1" Total Length : 6M/20Ft;Main Color : Red Weight : 70g Package Content : 1 x PU Air Tubing