Pinit Poster Panel Corrugated Cardboard Inserts. 30 x 40". .1875" thick, C-Flute, White on 2 sides. SKU: K3040 (0)No Reviews yet Add to Shopping Cart Details Inside: 7-1/4 x 10-7/8"" x 1-5/8"" deep Details Back DetailsInside: 7-1/4 x 10-7/8"" x 1-5/8"" deep Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review