uncoated paper and paperboard, of a kind used for writing, printing or other graphic purposes, and non-perforated punchcards and punch-tape paper, in rolls or in square or rectangular sheets, of any size, not containing fibres obtained by a mechanical or chemi-mechanical process or of which <= 10 % by weight of the total fibre content consists of such fibres, weighing > 150 g/m2, n.e.s.