Columbian Brown Kraft Gummed 9 x 12 Inch Columbian Catalog Envelopes 100 Count (CO671) A durable ALL-PURPOSE mailing envelope. Ideal for mailing documents, catalogs, direct mail, promotional material, brochures and more. Heavy-duty 28lb opaque brown kraft material provides privacy of contents. Open end closure. Moisture activated gummed seal. 9" x 12" 100 envelopes Catalog envelope with a 28-lb. paper stock. Use for mailing documents, catalogs, direct mail, promotional materials, and brochures. Heavyweight 28-lb. stock. Stock resists rips and tearing Give your documents the protection they deserve with these durable envelopes