For outdoor use. Enclosed Aluminum Framed Bulletin Boards are made of custom extruded parts engineered to provide accurate, durable and handsome cabinets. All corners are neatly mitred and assembled with heavy duty reinforcements and fasteners. Standard features include: Lockable doors, acrylic safety glass windows, continuous hinges, concealed mounting brackets and tackable burlap weave vinyl surface. Outdoor models feature a vented case for moisture reduction, weatherized rear panel and a thick rubber door seal.