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. Allow your customers and supporters to get back to you with payments, service requests, comment cards or other media in these courtesy reply mailers. These 8 7/8" x 3 7/8" #9 envelopes are made of 24 lb. stock and fit inside a #10 letter. Add your contact information and mailing ID, and we'll provide a printed Intelligent Mail Bar Code for improved service!