Quality Park No. 10 Single Window Security Tint Treated Business Envelopes

Business - #10 - 4 1/8" Width x 9 1/2" Length - 24 lb - Flap - White - 500 / Box. Material that inhibits the growth of mold and mildew to protect contents. Security-tinted with blue pattern to make it impossible to see the details of the contents even when held up to light.