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 [Min]: 0"; Capacity Range [Max]: 2"; Sheet Capacity: 375; Color(s): Black.