FAQS How many cards will be included in each mailing? 10,000 cards will be mailed to the best neighborhoods. Do I have to provide artwork for the ad? It’s up to you! We do provide complimentary ad design. Are there any long term contracts? We recommend doing multiple mailings for best results–but there are no contracts. What size are the cards and why? We use 9 X 12 cards because this is the largest flat mail piece allowed by the post office.