The wording of the article is "Esselte 56066 Polypropylene smooth punched pockets A4 60 μ". Unfortunately, the product is sent to the reference "Esselte 130899", whose thickness is only 40 μ (extremely fragile, so). Too bad, because I just need thick covers. Incidentally, it is the right reference that is specified in the technical description, but I confess I have not thought of controlling the time of ordering.