Pinit Billhead BACKINGS. 6 x 8-1/2". .028" thick acid-free board. White both sides. Long-term Storage. SKU: KAF28BH68 (0)No Reviews yet Add to Shopping Cart Details Billhead Backings 6 x 8-1/2" .028 thick Acid-Free Board White on both sides. Long-term storage. Details Back DetailsBillhead Backings 6 x 8-1/2" .028 thick Acid-Free Board White on both sides. Long-term storage. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review