RetailSource B080604KM1 Kraft Corrugated Mailers, 8" x 6" x 4" Corrugated mailers are manufactured from 200#/ect-32-b 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 1 box