BM1.) 50 - 10 1/4 x 10 1/4 x 1-- White Multi-Depth Corrugated Bookfolds Great for book, catalog and framed picture mailings. â€¢ Scored at multiple depths for flexibility. â€¢ Quickly package items â€” no carton set up. â€¢ Place product in center, fold in sides and seal. â€¢ Use tape to seal. â€¢ All manufactured from 32 ect-B corrugated. â€¢ Ships and stores flat.