Acco Pressboard data binder for 9-1/2 x 11 sheets Pressboard Data Binder for 9-1/2 x 11 Sheets, Retractable Hooks, Light Blue Expandable top-loading binder for small or large jobs. Most durable pressboard cover stock available and it`s an economical alternative to acrylic-coated pressboards. Retractable storage hooks hang from single point hanging racks or standard hanging files. Adjustable flexible nylon posts allow maximum capacity with minimum storage space. Designed for use with unburst sheets that are still attached in continuous form with accordian fold.