6 Common metals and their alloys; common metals, unwrought or semi-wrought, and their alloys; copper, aluminium and their alloys; building materials of metal; pipe fittings and forgings, of the following materials: copper, aluminium, copper alloys, aluminium and its alloys; semi-finished goods of metal; shaped parts of metal in the form of semi-finished products; casting moulds of metal; transportable buildings of copper, aluminium and their alloys; non-electric cables and wires of common metal; poles and profiles, not for electric purposes; pipes and tubes of metal; pipes of the following materials: copper, aluminium, stainless steel, copper alloys, aluminium and its alloys, stainless steel alloys; insulated pipes and pipelines; pipe connectors, valves and fittings; heat-insulated copper pipes; pipe bundles of the following materials: copper, aluminium, stainless steel, copper alloys, aluminium and its alloys, stainless steel alloys