Arrange your most important notes, papers, and records in the School Smart black 1 inch round ring binder. Our O ring binder design has a heavy-gauge chipboard front, back, and spine with a durable suede vinyl cover for extra protection. The O ring mechanisms are O-shaped and easy to open and close, so you can organize and store essential paperwork in your 3 ring binder. Made of polypropylene, the one inch binder also has two deep inner pockets to hold loose sheets of paper. This O ring file has a 225 sheet capacity, and the entire black binder measures 10 x 11-1/2 inches.