BACKINGS for Window Card Posters 14-1/8 x 22-1/8". .1875" thick C-flute Corrugated Cardboard. White both sides. Short-term Storage.

Window Card Poster Backings
14-1/8 x 22-1/8"
.1875" thick, C-flute Corrugated Cardboard
White both sides. Short-term storage.
Corrugated cardboard is .1875"thick (C-Flute, white on 2 sides). It is a popular choice for a backing board because it is rigid and economical.