Window Envelope - #9, Box of 500 - SKU 801365 is a dependable window mailing envelope for everyday mailing, filing and document handling in homes, offices, schools, clinics, retail counters and busy mailrooms. It features front window displays printed addresses to prevent reading errors. Fully gumm. Key details include #9, box/pack of 500. The easy-to-use closure makes it simple to prepare letters, forms, invoices, statements and other documents while helping keep contents neat, protected and ready for delivery. Its practical size, pack quantity and ready-to-use design help customers choose the right supply quickly, stay organized and maintain a smooth mailing workflow for routine correspondence and administrative tasks.