The product is a set of Prime Business Checks Double Window Security Envelopes. These envelopes are specifically designed for business use and come sealed with a .46 postage stamp. The double window design allows for easy labeling and addressing, while the security features help to protect the contents of the envelope during transport. Perfect for packing and shipping materials, these envelopes offer a reliable and professional solution for sending important documents and items. This listing is for a lot of 100 envelopes. Thanks for looking.