AmazonBasics AMZ92W #9 Double Window Envelopes, White, 500 ct 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