The S Superfine Printing Envelopes are 10 x 13 white catalog envelopes with a gummed seal, providing a secure closure for your mailings. These envelopes weigh 24lb Bond / 60lb Text / 90gsm, making them durable and sturdy for handling. With a pack of 50 envelopes, this product is ideal for businesses and individuals looking to send out catalogs, brochures, or other promotional materials in a neat and organized manner. Made in the United States, these envelopes offer quality and reliability for all your shipping needs.