Single and multitude of polyethylene copper tubing of sizes 1/4", 6mm OD, 3/8" OD with wall thickness of 1.0 mm., interlock wire armoured with PVC sheathing - suitable for 10.5 kg/sq.cm. working pressure, outer sheath is FRLS/HOFR PVC to protect against the corrosive atmosphere of Acids, Alkalis, Chemicals etc.