ACCO PRESSTEX 0.5 Inch Ring Binder, Letter Size, 100 Sheet Capacity, Light Blue (A7038602-C) Coated pressboard cover for excellent moisture resistance Holds up to 100 sheets with 0.5 Inch capacity round rings Double booster allows for easy adding and removal of documents Made of a minimum of 30 percent post-consumer recycled content, with a total of 60 percent recycled content Colorful cover adds flair to your work and offers you the option of color coding your projects