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. This 9" x 4 1/8" envelope from our Classic Collectiona, is made of 24 lb. stock with 3" x 3/16" and 4 1/4" x 1" windows to display both mailing and return addresses so you never have to fuss with sticky labels again! Create a custom return address from multiple or business locations without changing up envelopes.