These #10 double window security envelopes are designed for everyday business mailing of invoices, statements, and other sensitive documents. Each envelope features two front windows that allow recipient and return addresses to show through without the need for labels or handwriting, helping streamline office mailing processes. The interior security tint pattern helps reduce visibility of the contents, providing added privacy for confidential information during transit. A moisture-activated gummed flap creates a dependable seal once closed, making these envelopes suitable for routine business correspondence. Constructed with side seams and made from 24 lb white paper, these envelopes measure 4-1/8 x 9-1/2 inches and are compatible with standard #10 business documents. This pack includes 500 envelopes, making it a practical choice for offices, accounting departments, and small businesses with regular mailing needs.