Pinit Archival Foam Board Backings for 18 x 24" images. .125" thick (1/8"). All white. Acid & lignin-free. Buffered. Indefinite Display. SKU: KF1824125 (0)No Reviews yet Add to Shopping Cart Details Museum Grade 18 x 24" Frame Backings 1/8" thick, acid-free, lignin-free Buffered Foam Board. All white. Use for Indefinite display. Details Back DetailsMuseum Grade 18 x 24" Frame Backings1/8" thick, acid-free, lignin-free Buffered Foam Board.All white. Use for Indefinite display. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review