📬 Elevate Your Mailing Game with Security and Style! 500 envelopes to keep your business running smoothly. Our tinted security pattern keeps sensitive information safe. Extra-large window for effortless addressing. Perfect for invoices, statements, and legal documents. Moisture-activated seal ensures your documents stay secure. 4-1/2 x 1-1/8 window 500 count supply Ultra-secure design The #10 Single Left Window Security Tinted Envelopes are designed for professionals who value privacy and efficiency. With a secure gummed closure and a tinted security pattern, these envelopes are perfect for mailing sensitive documents. Each box contains 500 envelopes, featuring an easy-read window for quick addressing, making them ideal for bulk mailing of invoices, statements, and legal correspondence.