Pinit BACKINGS for Lobby Cards 11 x 14". .0625" thick E-flute Corrugated Cardboard. White two sides. Short-term Storage. SKU: K1114625 (0)No Reviews yet Add to Shopping Cart Details .0625" thick E-Flute Corrugated Cardboard. White on 2 sides). It is a popular choice for a backing board because it is thin, rigid and economical. Details Back Details.0625" thick E-Flute Corrugated Cardboard. White on 2 sides). It is a popular choice for a backing board because it is thin, rigid and economical. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review