How you fold a letter will determine the final cost of your mailing project if you use a professional mail service. A “Z” or “Accordion” fold will cost you $60/1000 more than a “C” or “Letter” fold. That’s because a “Z” fold cannot be inserted by machine. It must be inserted by hand. Keep that in mind when you have a mailing that requires a folded letter. For more information call at 612-789-7226.