Pinit Photo BACKINGS for 3-1/2 x 5" Photos. 3-3/8 x 5". .028" thick acid-free board. White both sides. Long-term storage. SKU: KAF2835 (0)No Reviews yet Add to Shopping Cart Details Acid-Free Backings for 3 x 5" Images 3-3/8 x 5" .028" thick Acid-free Board. White on both sides. Safe for long-term storage of photos. Details Back DetailsAcid-Free Backings for 3 x 5" Images 3-3/8 x 5" .028" thick Acid-free Board. White on both sides. Safe for long-term storage of photos. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review