The product is a box of 400 “Important Tax Return Documents Enclosed” envelopes. These envelopes are designed to securely hold and protect important tax return documents during shipping and mailing. With a clear message indicating the importance of the enclosed documents, these envelopes provide peace of mind for both the sender and recipient. Ideal for businesses or individuals who need to securely send tax return documents, this box of envelopes offers convenience and security in one package.