Pinit Photo BACKINGS for 4 x 5" Photos. 4 x 5". .028" thick acid-free board. White both sides. Long-term storage. SKU: KAF284X5 (0)No Reviews yet Add to Shopping Cart Details 4 x 5" Photo Backings 4 x 5" .028" thick Acid-free Backings White on both sides. Safe for long-term storage of photos. Details Back Details 4 x 5" Photo Backings 4 x 5" .028" thick Acid-free Backings White on both sides. Safe for long-term storage of photos. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review