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Office Elite's #10 Double Window Speed Seal Security Envelopes Premium quality, unparalleled value, and maximum protection-guaranteed to fit QuickBooks invoices and statements as well as other computer-generated invoices perfectly, with enough room to include multiple invoices or statements at once! Mail your invoices and statements with confidence and style. Our #10 envelopes feature an ultra-strong adhesive strip and elegant 24-pound white wove paper stock-they're easy to use and engineered to deliver a secure, hassle-free mailing experience. The use of double-window self-seal security envelopes for business documents is beneficial for both the sender and the recipient-a few of these benefits are: Double-Window Design Is a Time SaverThese no 10 window envelopes are ideal for most standard computer-generated invoices. Send up to 550 invoices quickly and easily! Perfect for Businesses and Small Business Owners Everything about this envelope-from the window placement, to the speed seal strip, to the security pattern-has been designed with QuickBooks users and business owners in mind, making the process of mailing invoices and statements easy!Added Privacy and SecurityThick 24 lb. white wove paper and a powerful security pattern protect your private information as well as your clients' personal information while in transit-mail invoices with confidence knowing that your sensitive data is protected!High Quality Strip-and-Seal AdhesiveA speed seal flap with our top-of-the-line adhesive ensure that these envelopes are easy to use while providing an ultra-strong, permanent seal.Office Elite's #10 Double Window SPEED SEAL Security Envelopes: premium quality, unparalleled security, and exceptional value (featuring a long-lasting supply of 550 envelopes per box). Take advantage of our limited-time sale price: scroll up and click the Add to Cart button today!