Pinit Backings for 12 x 18 Prints. .030" thick Chipboard. White on one side. Short-term Storage. SKU: KCB301218 (0)No Reviews yet Add to Shopping Cart Details This board is pH neutral (contains acid), .030" thick. White on one side. ECONOMICAL. Details Back DetailsThis board is pH neutral (contains acid), .030" thick. White on one side. ECONOMICAL. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review