#10 DOUBLE WINDOW SECURITY ENVELOPES: SIDE SEAM GUMMED FLAP CONSTRUCTION! #10 Double Window envelope is perfect for mailing invoices, statements, and standard business & legal documents. The custom security tint protects your personal information as well as your customer's. Privacy and confidentiality are critical for all business and legal transactions, so you need an envelope that meets your standards. Perfect for business, these envelopes allow you to send out advertisements, invoices, special offers, and more, while maintaining an image of professionalism. Your customers will be suspicious of unprofessional mail, but now, you can ensure that more letters will be opened, leading to more sales, opportunities, and relationships. Stand out from the crowd! In the modern world of business, too many people have forgotten the value of an old-fashioned letter. Simply by reaching your customers through the mail, you are instantly placing yourself in their homes, providing a physical reminder of your products and services. A letter is much harder to ignore than an email. Your competitors are probably relying on the internet to secure their business, but when you apply even a small effort toward marketing through the mail, you will stand out as a unique, more "real" business. The 1 X 3-1/2" Top Window is 1/2" from the left and 2-1/2" from the bottom of the envelope. The 1-1/8 X 4" Bottom Window is 1/2" from the left and 3/4" from the bottom of the envelope. Click "Add to Cart" now!