Office Depot Double-Window Envelopes, 10 (4 1/8in. x 9 1/2in.), White, Clean Seal(TM), Box Of 250, 77139 Ideal for check-writing software, computer-generated forms and more No need to write out labels! Windows display the return and mailing address. Security-tinted inside for privacy and confidentiality. Self-adhesive closure keeps contents safely inside.