Easily send everyday mail with the Mead #10 Press-It Seal-It Security Envelopes with Viewing Window. These #10 size envelopes measure 4-1/8" x 9-1/2" and can hold folded letter-size documents. There's no need to write out names and addresses for your recipients. The left viewing window lets you view the address printed on your document. Quick and simple sealing. Mead Press-It Seal-It envelopes feature a self-adhesive strip to help keep your contents safe and secure. Keep your personal information personal. These all-purpose 20 lb. white envelopes are great for office and home use. Box contains 500 envelopes. Made in the U.S.A. with SFI certified sourcing.