Pinit Conservation Grade BACKINGS Rock & Personality Posters. 20 x 28" .040" thick. Acid & Lignin-free, Buffered. All white. Indefinite Storage. SKU: KAF40KRPP (0)No Reviews yet Add to Shopping Cart Details MUSEUM GRADE Rock & Personality Backings 20 x 28" .040 " thick Acid-free & Buffered Board All white. Indefinite Storage. Details Back DetailsMUSEUM GRADE Rock & Personality Backings 20 x 28" .040 " thick Acid-free & Buffered BoardAll white. Indefinite Storage. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review