The Leuchtturm Numis Numismatic Pouch, 20 compartments, reference 338571, pack of 5 units, is a coin filing sheet measuring 34x34mm 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 Numis classifiers of the same brand. This 34x34mm reference is one of the most common sizes for medium-diameter circulating coins.