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 6 1/2" x 3 5/8" envelope is made of 24 lb. stock and great for everyday transactions and correspondence, and the confidential lining protects your private information. Customize them by adding your company logo, emblem or icon along with your contact and address information.