The product is a set of Staples #9 gummed envelopes with a privacy tint and double window. Each envelope measures 3-7/8 inches in width and 8-7/8 inches in length. Made in Mexico, this model (ST266759) is suitable for various business and industrial mailing needs. With a pack of 500 envelopes included, this product offers a reliable and secure option for sending confidential documents or sensitive information.