For extremely large files, Jalema has developed the sliding expandable spine. The ExtensionFile is a folder that adapts to the thickness of the content you want to store. The principle of this folder is that the front cover is literally expandable, allowing the capacity of this folder to increase from 1 to 7 cm. The Extension folder is made of strong 335-gram Tenax cardboard, partially double-glued, and features a neat print. The instructions for this folder with JalemaClip are printed inside the front cover. Additionally, the folder closes at the corners with a black elastic. The content and the front and back covers are connected by our unique binding mechanism "JalemaClip," consisting of a long black tube, a black compression plate, and a long anthracite stirrup. Thanks to the JalemaClip, sheets can be removed or inserted in a snap. * Product features; * Made of strong, partially double-glued Tenax cardboard, 335 grams. * Expandable folder from 1 to 7 cm. * Equipped with JalemaClip. * Size: 310x220x10-70mm