Printfile is a quality range of USA made polyethylene film file sheets in most formats. Archivally sound, it also has the advantage that it is very soft, making insertion of film easy, and minimising abrasion. All the sheets we stock are punched for standard UK 4-hole binders. The principal formats are shown below. As well as a standard format for 120, for strips of 3 square negatives (120-4B), there is an extra wide sheet (120-4UB) designed for 6x7 in in strips of 3. LINK: Printfile manufactures site