Wilson Jones Heavy-Duty Round Ring View Binder w/Extra-Durable Hinge, 1/2 inch Cap, BlackHeavy-duty binders feature an extra-durable hinge and are made of custom-formulated, PVC-free polypropylene. Polypropylene binders last up to 10x longer. Built to last, these binders have three never-gap round rings to provide spill-free document security. Clear-view covers and spine allow quick and easy binder customization. One-year performance guarantee. Capacity Range [Max]: 1/2"; Sheet Capacity: 120; Color(s): Black; Binder Sheet Size: 8 1/2 x 11.