Envelopes are made with a material that inhibits the growth to protect the product. 9 x 12 catalog envelopes with Redi-Strip closure and heavyweight 28 lb. white wove stock 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 sturdy catalog envelopes are made of 28 lb. white wove stock that can withstand extensive handling, as well as mailing. Content during use to give you assurance that they arrive unharmed. Perfect for folded or smaller documents to fit snugly. Redi-Strip closure assures a permanent seal. Purchasing envelopes will be at a minimum with the convenient 100 count giving you more time to focus on business. *Licensed by SilverCo.