The product is a pack of 250 9 x 12 open-end window envelopes from the brand LuxPaper. These envelopes are made of 24lb paper, providing durability and strength for various shipping and mailing needs. Ideal for businesses and industrial use, these envelopes offer a convenient and practical solution for packaging and sending items. The open-end design allows for easy insertion and removal of contents, making them a versatile option for everyday use.