Museum Grade Storage Box for 8-1/2 x 11" and 9 x 12" Photos & Prints. 12-1/2 x 9-1/2 x 3". TAN. Drop front. Acid-Free, Lignin-Free, Buffered. 60 Pt. Barrier Board.

The archival material used for these boxes is 60 ptpoint, solid-core, acid-free, lignin-free cellulose fibers. It is buffered with a 3% calcium carbonate, which blocks migrant acids, The boxes have a pH of about 8.5. They have metal-edged corners and ship assembled. Boxes have passed the Photo Activity Test certifying that they are safe for the indefinite storage of photos.