The Mead #10 Security Business Envelopes are designed for professional use in business settings. These white envelopes have a printed lining and a gummed flap for secure closure. Made of 20 lb paper, each box contains 40 envelopes of size 4 1/8″ x 9 1/2″, perfect for handling and shipping documents. Manufactured in the United States, these envelopes offer reliability and security for your important communications.