The one-piece design of this soft fold box provides a seamless presentation for stationery products. FB24 measures 4 1/2" x 1/4" x 5 7/8" and fits a single A2, 5 1/2 Baronial envelope and card up to 1/4 inch thick. This box can be sent through the mail at a hand canceled letter rate. Quick to assemble and crystal clear.