For the preservation, presentation and archival storage of art, prints, photographs and other valuables. Our quality and archival-safe construction is your assurance of professional time-tested protection. Manufactured from heavyweight (0.98) binder board. The outside is covered with black library quality acrylic. The inside liner is white acid-free archival paper. Two sizes available: 11″ x 14″ and 16″ x 20″.