No. 9 envelopes feature security tint and double windows and are compatible with most standard letter-size, computer-generated invoices and statements. The 1-3/16″ x 3-1/2″ top window is positioned 3/8″ from left and 2″ from the bottom of the envelope. The bottom window (1″ x 4″) is 3/8″ from the bottom. 24 lb. #9 (8.88″ x 3.88″) – 24lb – 500 / Box – White