Thanks There is a tube connected to the N2O adapter, with the single-use tanks inside that. I had to thread the string through the tube (which surprisingly wasn't that hard). When the button is pushed, the string is obviously shot out...and I'm talking far! It goes at least 20 feet if you hold the button down. It's a shorter distance if you just push it really fast, but it's still cool. I'm still trying to work on getting some type of cartridge with the string, so I don't have to thread it through everytime, but I can't figure out a decent way of doing it.