The product is a set of 12.75×15 rigid stay flat mailers, consisting of 100 white cardboard envelopes. These self-seal shipping envelopes are designed for secure and easy mailing of documents or small items. Made in the United States, they are ideal for businesses or individuals looking for a reliable and high-quality packaging solution for their shipping needs. The size of the envelopes makes them versatile for sending a variety of items, while the stay flat design ensures that contents are protected during transit.