Archival Oversized 3-Ring Album Box with Clamshell Style Lid, 13" x 11-7/16" x 2-3/8" Acid Free Board with metal edges. Large 1 1/2" 'D' rings hold most oversized 3 hole punched pages neatly. Clamshell Lid protects from dust and light. Black, acid free outside with protective metal edges, soft white acid free buffered inside.