OEM Quality Park No. 9 double window envelopes, perfect for standard, letter-size, computer-generated invoices and statements. These envelopes feature two poly windows that display return and mailing addresses clearly. The top window measures 1-3/16" x 3-1/2" and is positioned 3/8" from the left and 2" from the bottom, while the bottom window measures 1" x 4" and is positioned 3/8" from the left and 1/2" from the bottom. Made from white wove, 24 lb. paper, these envelopes also include an inside security tint for privacy and a gum closure for secure sealing.