Redi-strip Catalog Envelope, #13 1-2, Cheese Blade Flap, Redi-strip Closure, 10 X 13, Brown Kraft, 100-boxCatalog envelopes with Redi Strip closure for home or office mailing, storage and organizing. Keeping your home or business organized is imperative! Whatever your needs, catalog envelopes are a must for keeping projects, files and mailings manageable. These heavyweight catalog envelopes are made of 28 lb stock that can withstand extensive handling, as well as mailing. Seam Type: Center; Flap Type: Cheese Blade; Trade Size: #13 1 2; Security Tinted: No.