Unibind Thermal SteelCrystal Transparent Cover 5mm Dark Blue Spine Portrait (Binds up to 80 Pages) [5 Pack] No hole punching or glue required. Cover spine features a low-temperature nylon-based resin that can be re-heated if materials need to be edited after the original binding has been completed. This can be done by removing the pages from the side, not the top. Business Book Creator is needed to complete the binding (sold separately). Binds a soft cover in seconds/ Professional finish Easy to add and remove sheets/Binds up to 80 Pages (40 Sheets)