Corrugated Mailers are super strong yet light-weight to save on postage. > Perfect for shipping small, light-weight fragile items. > Corrugated Mailers are manufactured from 200#/ECT-32-B oyster white corrugated. > Crush resistant mailer folds to provide double walls of protection on front and sides. > Unique "Wave-Rule" edge virtually eliminates paper cuts. > These one piece mailers fold together in seconds. > No tape, glue or staples needed. > All ship and store flat to save space.