The product is a 100 pack of 9×12 self-seal brown kraft manila envelopes, perfect for business use. Made of cardboard, these catalog mailers feature a self-seal closure for secure shipping and handling. The brown color adds a professional touch to business correspondence, making it ideal for sending documents, invoices, and other materials. Whether you need to mail out promotional materials or important business documents, these envelopes provide a reliable and efficient solution.