7 x 4 x 3" Kraft Corrugated Mailers. Kraft Corrugated Mailers are light-weight to save on postage. Perfect for shipping small, light-weight fragile items. Corrugated Mailers are manufactured from 200#/ECT-32-B kraft corrugated. Crush resistant mailers fold to provide double walls of protection on front and sides. No tape, glue or staples needed. Proudly made in the USA!