Business Source Double Window Envelope - 500 per box

Mail out invoices and checks safely with No. 9 double window envelopes. Security tint and strong adhesive backing ensures contents are protected while in transit. Works with most letter-size documents. Features a 1-3/16" x 3-1/2" top window 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. 500 envelopes per box.