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500 standard-size security-tinted #9 double window envelopes
Ideal for 8.5-by-11-inch computer-generated invoices and statements
Double windows 3/8-inch from the left to show sender info (2 inches from bottom) and recipient info (1/2 inch from bottom)
#9 envelopes measures 3-7/8 by 8-7/8 inches each
AmazonBasics #9 Double Window Envelopes White 500 ct - PL5OLOZW5