The Leuchtturm Optima Numismatic Pouch with 35 compartments, reference 306013, pack of 5 units, is a coin filing sheet measuring 27x27mm each. Leuchtturm is a German brand founded in Hamburg in 1917, considered a world leader in collection systems for philately and numismatics, with a catalog of over 6000 items covering more than 140 collection areas. It is made of transparent film free of acids and plasticizers, allowing you to see the coins on both sides without removing them from the sheet and without risk of oxidation from contact with chemicals. It is compatible with the Optima classifiers from the same brand. The smaller compartments of this reference, 27x27mm, allow you to file a larger number of coins per sheet, making them suitable for coins with a smaller diameter.