Quality Park Reveal-N-Seal #10 Window Envelopes - 4-1/8" x 9-1/2" - 500 Pack#10 Single window security tinted envelope with Reveal N Seal self seal closure is the ultimate in convenience and security. Self seal closure alleviates the need to moisten flaps and to throw away pull off strips. Simply fold bottom flap up and press for a secure seal! Window conveniently accommodates the printed address eliminating hand addressing. Perforated lines along flap show evidence if tampering is attempted. The innovative design preserves