Pinit Backings for Postcards/Photos. 5 x 7". .030" thick chipboard. White on one side. Short-term storage. SKU: KCB3057 (0)No Reviews yet Add to Shopping Cart Details 5 x 7" Backings for Postcards/Photos 0.030" thick, pH neutral chipboard. White on one side. Short-term storage. Details Back Details5 x 7" Backings for Postcards/Photos 0.030" thick, pH neutral chipboard. White on one side. Short-term storage. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review