Pinit BACKINGS for One Sheet Posters. 27-1/8 x 40". .1875 thick Foam Board. Acid-free & Buffered. Indefinite storage. SKU: KOSPFC (0)No Reviews yet Add to Shopping Cart Details MUSEUM GRADE One Sheet Poster Backings 27-1/8 x 40" .1875" thick Foam Board. Acid-free & Buffered Board All white. Indefinite storage. Details Back DetailsMUSEUM GRADE One Sheet Poster Backings 27-1/8 x 40" .1875" thick Foam Board. Acid-free & Buffered BoardAll white. Indefinite storage. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review