· SECURE DOUBLE WINDOW ENVELOPES: High-quality #10 envelopes with two address windows, perfect for invoices, statements, and legal documents. Features security tinting to protect sensitive information.· PRIVACY PROTECTION: Interior security pattern obscures contents, ensuring confidentiality for your business and personal correspondence.· CONVENIENT FLIP & SEAL: Easy-to-use adhesive closure seals quickly without moisture, providing a secure, tear-resistant seal for your mailings.· PRECISE WINDOW PLACEMENT: Dual windows positioned for optimal visibility of addresses, streamlining your mailing process and ensuring proper delivery.· BULK PACK FOR BUSINESS: Set of 500 envelopes (4⅛" x 9½") made with durable 24LB paper stock, ideal for high-volume mailings and long-term office supply.