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Business Source No. 9 Double Window Invoice Envelopes [ENVELOPE;DOUBLE WINDOW;#9-BX] 5970 Discover a snack that combinesEnhance your mailing efficiency with these double window #9 envelopes, designed for seamless correspondence. Perfectly crafted to display both sender and recipient addresses, these envelopes save you time while ensuring accuracy in delivery. Ideal for businesses and individuals alike, they offer a professional touch to every piece of mail you send.