Wilson Jones 38434B Heavy-Duty D-Ring Binder w/Extra-Durable Hinge, 1 1/2" Cap, Black Locking D-Ring holds 40% more than standard round rings. No-Gap locking feature keeps pages from falling out. Ink resistant material keeps print from sticking to covers. Made from heavy duty vinyl to resist tearing and cracking over time. Pocket Guard on both inside covers holds loose papers secure in their pockets.