For A4 hanging files with rider (up to 30 hanging files), 5 archive boxes (10cm) or 7 binders (8cm). Made of sturdy acid-free corrugated cardboard. Easy to assemble (automatically foldable). Pre-printed for content indication. Included lid. Inner ft: 37 x 62.2 x32.2 cm. Gray cardboard with white print. Pack of 5 pieces FSC certified.