Heavy Duty View Binders feature an extra durable hinge and are made of PVC free polypropylene. Longer lasting than vinyl binders, heavy duty polypro binders have D-rings to keep papers secure. Heavy Duty binders are built to last and come with a 1-year satisfaction guarantee. Binder Type: Ring; Binder Style: View; Binder Size Capacity: 3"; Binder Sheet Capacity: 670.