Keep Member’s Mark™ Envelope #10, Double Window (500 ct.) on hand to send all your important letters and documents. These double window self-seal envelopes are a must-have in any office and great for personal use as well. About Member’s Mark Envelope #10, Double WindowThis box holds 500 security window envelopes that display the sender’s and the receiver’s addresses. It has an easy and secure peel and seal closure style and a security tint inside each envelope for privacy. These #10 envelopes are made of white woven paper and measure in at four and one-eighth inches by nine and a half inches, making them perfect for an array of documents. Who Needs Peel and Seal Window Envelopes?Anyone who regularly sends mail and doesn’t want to use sticky labels or write out their own labels. These are especially useful for sending invoices, checks and important forms, though they can be used as an envelope for every-day snail mail letters as well. With 500 double window envelopes on hand, you can keep your home and work office well-stocked for every mail eventuality. Are Member’s Mark Envelope #10, Double Window Convenient?Yes! These window envelopes are designed to be ultra-convenient. With these, you no longer have to dabble with sticky labels or hope the letter carrier can decipher your writing, as each window reveals the address of the sender and the receiver. Each business window envelope closes easily and securely with its peel-off and seal closure, which means no moisture is required. Because of its security print on the interior, these envelopes will ensure your important documents can’t be spied on. And if you have a few spare double window envelopes laying around, they can be used as a notepad in a pinch. These peel and seal window envelopes are also certified by the Sustainable Forestry Initiative, meaning the paper used in making them was responsibly sourced and are an eco-friendly choice.