Poly File Folders are made of an extra-heavy, PVC-free, 17 point polypropylene material to support frequent use. 1/3-cut tabs (1/2" high) are in assorted positions. Waterproof and tear-resistant material folders are scored for 3/4" expansion. Front panel is undercut. Front and back top corners are rounded. Folders offer acid-free, archival quality so they will last.