Extremely practical headings in cardboard with colored numbered keys. Thanks to the special film which covers the index page, the content of the latter can be written with an ordinary ballpoint pen or with a permanent marker and corrected or updatedsubsequently, in a rapid and fast, for many timesover time. Just erase the text with a rubber plastous documents. A4 size maxi which allows storing eic and rewrite the new one.nvelopes to universal drilling A4.
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