A door hanger is usually a flyer with a cut customized to fit a door knob.  It’s a great way to stretch your advertising dollars without the high cost of direct mail. They can help you announce your specials or tell everyone in your area that you're the new business down the street. They help you add those new customers who have moved into your area and haven't seen your sign, or your building. Door hangers can range from size and paperstock.