Cardinal Slant-D Ring Binder, Heavy-Duty, 4" Capacity, Black Slant-D Ring Binder is made from heavy-duty injection molded polypropylene with dual-fold living hinge cover. Guaranteed not to crack or break even with most active use. So easy to operate, a single finger can open, close and lock tight. Archival safe for all documents and photos. Sheet lifter in all sizes. Labels included. Earned Ease-of-Use Commendation from the Arthritis Foundation.