The description of the item 7409190020 of France HScode: Plates, sheets and strip, of refined copper, not in coils, of a thickness of > 0,15 mm (excl. expanded sheet and strip and electrically insulated strip) : Plates or sheets consisting of a layer of a silicon nitride ceramic with a thickness of 0,32 mm (± 0,1 mm) or more but not more than 1,0 mm (± 0,1 mm) , covered on both sides with a foil of refined copper with a thickness of 0,8 mm (± 0,1 mm) and on one side partially covered with a coating of silver