The Leuchtturm Optima 24-Compartment Numismatic Pouch, reference 319236, pack of 5, 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. Made of transparent film free of acids and plasticizers, it allows 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. This 34x34mm reference with 24 compartments allows you to file more coins per sheet than the 12-compartment version of the same Optima line.