Quality Park No. 10 Security Envelopes with Window - Business - #10 - 4 1/8" x 9 1/2", Flap - 1 / Box - White (QUA90119R) 1 BoxSecurity business envelopes with a window are made with a material that inhibits the growth of mold and mildew to protect the product. Redi Strip on the flap provides a clean, quick seal immediately upon contact. Simply peel off the adhesive strip and press to seal. The peel off strip protects the adhesive from dust for a longer shelf life. No. 10 envelopes are tinted to protect the privacy of your contents. General Information Manufacturer: TOPS