Business Source Kraft Gummed Catalog Envelopes - Catalog - #12 1/2 - 9 1/2" Width x 12 1/2" Length - 28 lb - Gummed - Brown Kraft - Kraft - 250 / Box Heavy-duty, all-purpose mailing envelopes are ideal for mailing documents, catalogs, direct mail, promotional material, brochures and more. 28 lb. opaque Kraft construction delivers privacy of contents. Open-ended style allows you to easily insert and remove items. Moisture-activated, gummed flap provides a secure seal. 9-1/2" x 12-1/2" size is perfect for documents without folding.