The product is a pack of 500 #8 double window security QuickBooks check envelopes by White Kaiman. Made in the United States, these peel-and-stick envelopes are designed for securely mailing checks and other documents. The double window feature allows for easy labeling and address visibility, while the security design helps protect against tampering. Ideal for small businesses or individuals needing a reliable and efficient way to send important documents via mail.