Quality Park - QUA41415R 9" x 12" catalog envelopes are made with a material that inhibits the growth of mold and mildew to protect your contents. They feature a Redi-Strip closure and heavyweight, 28 lb. white wove stock for home or office mailing, storing and organizing. They are a must for keeping projects, files and mailings manageable. Sturdy, 28 lb. stock withstands extensive handling and mailing. Contents are protected during use to give you assurance that they arrive unharmed. 9" x 12" size is perfect for folded or smaller documents. Redi-Strip closure ensures a secure, permanent seal.