* ADOC System, the flexible binding system with multiple advantages over other binding systems. * The unique ADOC perforation allows every combination to be possible and always compatible. * Ideal combination of design and functionality. * Pages are easy and quick to remove, add, or reorganize. * Luxurious notebook with 500 micron hardcover, polypropylene (PP). * 72 sheets - 144 pages of 90g. * With practical ADOC graduated ruler. * Assorted colors.