Wilson Jones D-Ring Vinyl View Binder, 1-Inch Capacity, Black (W386-14B) Cover made of polypropylene, and is PVC-free Increased-capacity, D-ring binder holds more paper than conventional round ring binders - all within a sleeker, slimmer profile. Binder rings are mounted on the back cover, making it easy to fold the cover back and under the binder. Folded back front cover can double as a handy writing surface. Two inside pockets provide additional storage.