If paper and postage is how your business gets done, we can provide the gear you need. Choose from stationery products, including envelopes, letterhead, customized reply and confirmation return cards, invoices and statements, and claim forms for the insurance and medical industry. Look to our Classic Collectiona, for these dual-window envelopes to make your next mass mailing campaign hassle free! These 8 5/8" x 3 5/8" mailers are made of durable 24 lb. stock with a self-sealing closure. Inquire about prices for larger quantities and other options.