Description STANDARD SIZE – Easily send everyday mail. These #10 size envelopes measure 4-1/8″ x 9-1/2″ and can hold folded letter-size documents. VIEWING WINDOW – 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. SECURE SEAL – Quick and simple sealing. Mead Press-It Seal-It envelopes feature a self-adhesive strip to help keep your contents safe and secure. SECURITY LINING – Keep your personal information personal. These envelopes have a security lining to help maintain privacy of your documents. VALUE PACK – 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.