Sparco Slant-D Ring Binder, with Sheet Lifter, 4 Inches Cap, 11 x 8-1/2 Inches, BK (SPR26971) Locking Slant-D Ring Binder features no-pinch rings that open, close and lock with one touch Holds 25 percent more sheets than standard round-ring binders Made from polypropylene so contents will not stick to the binder cover