Vinyl is reinforced with heavyweight board that stands up to the toughest use. Heavy-duty round ring mechanism holds contents tightly in place. No ordinary casebound ring binder, this heavyweight storage giant holds its shape?even when subjected to rough, constant use. Heavy-Duty four round ring mechanism holds contents tightly in place. Capacity Range ("): 0 in - 2 in; Sheet Capacity: 375; Color(s): Black; Binder Sheet Size: 14 x 8 1/2.