Heavy-duty, all-purpose mailing envelope is 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 easy insertion and removal of items. Moisture-activated gummed flap ensures a secure seal. 10 Manila 9 x 12 Kraft Catalog Mailing Envelopes Self Seal Mailers Made in U.S.A Product Information Mailer/Envelope Type:Catalog Mailer/Envelope Classification:#10 1/2 Mailer/Envelope Width:9″ Mailer/Envelope Length:12″ Mailer/Envelope Weight:28 lb Closure Type:Gummed Closure Side:Open End Seam:Reinforced Features:Reinforced