6 Copper and its alloys; copper, unwrought or semi-wrought; copper alloys, unwrought or semi-wrought; copper ingots; copper-base alloy ingots; castings, foils, powder, and rolled, drawn or extruded semi-finished articles of copper or its alloys; foils of copper and its alloys for printed circuit boards; copper strip; copper alloy strip; copper plates; copper alloy plates; sputtering targets of copper and its alloys; coils made of copper and its alloys