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Save time by eliminating the need to address envelopes. Double-window envelopes make mailing correspondence, invoices, and payments more efficient and easier than ever. Accurately display mailing and return address information with confidence. Double-window envelopes have a tinted inside pattern to help keep the contents secure. Select envelopes are self-sealing, creating a secure seal when the flap is closed. Secure your sensitive financial information and business correspondence with double-window business envelopes from The Bradford Exchange.