Pinit Poster Panel Corrugated Cardboard Inserts. 25 x 37". .1875" thick, C-Flute, White on 2 sides. SKU: K2637 (0)No Reviews yet Add to Shopping Cart Details Poster Panel Corrugated Cardboard Inserts. 25 x 37" .1875" thick, C-Flute, white on 2 sides. Details Back DetailsPoster Panel Corrugated Cardboard Inserts.25 x 37".1875" thick, C-Flute, white on 2 sides. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review