Card games are used by many people, whether they are on holiday or during the lunch break with their colleagues at work. Why not hand out your own card games? So everyone looks at your logo/product/... and most of them won't even be notice they are looking at ads. By printing the cards on both sides you can get even more information on the cards! The box can be printed as well. Do not hesitate any longer and order them now!
You aren't sure how to properly design your print file? Check out the design guidelines for Playing cards.