RetailSource B120902WM5 Corrugated Mailers, 12" x 9" x 2" (Pack of 5) 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 5 box