Heavy-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 satisfaction guarantee. Binder Type: Ring; Binder Style: View; Binder Size Capacity: 1"; Binder Sheet Capacity: 200.