Wilson Jones DublLock Casebound Round Ring 3-Ring Binder, 11" X 17", 1" Capacity, Black, W344-70 Black vinyl casebound binder Reinforced with heavy weight board that stands up to the toughest use Heavy-duty DublLock round ring mechanism holds contents tightly in place Equipped with DublLock Rings for secure document storage Has a 1 Inch capacity to store up to 175 sheets of paper