Shop All: Double Window Confidential Envelope, Colors Design, 9 x 4 1/8 These colorful double window confidential envelopes are designed to securely hold sensitive documents while adding a pop of color to your office supplies. With two transparent windows for the sender and recipient addresses, these envelopes are perfect for mailing invoices, statements, and other confidential correspondence. Available in various quantities ranging from 250 to 10000, these envelopes are ideal for businesses of all sizes. Stand out from the usual white envelopes with these vibrant options, ensuring your mail gets noticed while maintaining privacy and confidentiality. Order yours today!