Gaylord Archival Flip-Top Photo Preservation Box Safely store photos, prints or cabinet cards for future generations Archival-quality, unbuffered 40 pt. barrier board box is acid-free, lignin-free and pH 8.0-9.0 Passed P.A.T. (Photographic Activity Test), the international standard test for evaluating the quality of photo storage and display products Metal edges add strength & style; flip-top lid keeps out dust, dirt & light, while offering quick access to contents Your family history deserves the same level of protection used by the world's leading cultural institutions