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First Class double window envelopes are software compatible to be used with Ultra Tax by Creative Solutions, ATX, 1040, and Max software packages. This envelope has a portrait orientation for the documents. Double windows simplify mailing by printing the cover sheet with the appropriate software, and having both the recipient address and return address show through the envelope windows. This first class mail envelope features a peel and seal closure to make them even easier to use. It also has a blue diamond border, and First Class Mail printed on its face. Tax return envelopes measure 9-1/2" x 12" and open on the short side.