EnvyPak Crystal Clear Booklet Style Envelope 6" x 9", Permanent Tape (5.5&Prime; x 8.5&Prime; Insert Size) Holds Booklets, Catalogs and Brochures. - 3.5 mil Polypropylene - Box of 500 100% polypropylene, clear mailing envelope Permanenet peel and stick closure Holds 8-1/2" x 5-1/2" catalog or booklet MADE IN THE USA - manufactured in Marysville, OH