The product is a 50 pack of W2 envelopes with security windows, specifically designed for self-sealing and ideal for tax return forms. These envelopes offer a secure and convenient way to send important documents, ensuring privacy and authenticity. The self-sealing feature adds an extra level of security, making it difficult for unauthorized individuals to access the contents of the envelope. The envelopes are compatible with various types of documents and provide a reliable solution for businesses and individuals handling sensitive information.