Citizen Metalloys Ltd offers Copper & Copper Alloy Tubes. Citizen Metalloys Ltd is an ISO 9001: 2000 certified company. Copper & Copper Alloy Tubes are hot extruded and cold drawn copper tubes. They are manufactured in the sizes of 4 mm O.D. To 101.6 mm O.D. And have the wall thickness of 0.27 mm to 20 mm. These tubes are available in the shapes of square, rectangular or any other shapes.