Not a magic trick...just a dumb gag that you can use as an icebreaker for anyone you think has potential to be that special someone...
The cards read "If you think I am the best looking guy in the world, smile. If not, JUST TEAR THIS CARD UP". But the cards are printed on an odd kind of "paper" (Tyvek, maybe, I think) which makes them very difficult to tear. Therein lies the gag, as the unsuspecting victim (or pick-up...you decide) reads the card and tries to rip it up.
The cards are slightly larger than poker sized playing cards -- larger than standard business cards. They are blank on the back, in case you want to put your contact info on it.
A great ice breaker...depending on what kind of bars and parties you frequent. You get 6 cards, which should last years, since they can't be torn. They do get a bit wrinkled or bent around the edges after 10 or 12 people have tried to tear the same card, but can be smoothed with your fingers to still look fine. So you can use a single card over and over.
No instructions, but you already get the idea on how to use these.