The product is a pack of 1000 white machine insertable A2 invitation envelopes, with dimensions of 4-3/8 x 5-3/4 inches and a gum seal. Made in the United States, these envelopes are ideal for business and industrial applications, providing a secure and professional way to send invitations or other important documents. The high quantity of envelopes ensures that you have an ample supply for all your mailing needs.