The Blow by Dylan Sausset 
The Blow is an easy gimmick to make and use. And close to invisible. With this gimmick, you will make a card go through a bill given to you by the spectator. It's quick, durable, there is no elastic thread, no latex, and the card really goes through when you blow on it! In this download, you can learn how to make it and use it in about 15 minutes. With routines that I use. You will need to buy something else to build it (around a dollar). 

Download the video and learn.