While the "make a blister on your finger" trick may be a little old, this effect puts a new twist in it. The spectator chooses a card, you bring out a lighter and proceed to light it up, "grab" the flame, and then show your fingertips to show them their chosen card.
The nice thing about this trick is that you can repeat it four times with different results. In truth, if the setup is right you can actually switch around the pips to get more combinations, but that will require a little more wiggle room when the spectator isn't watching you closely.
The gimmick is very well made and fits reasonably well in your pocket. You're better off putting this in your jacket pocket as it gives you more room to "do the magic", but if you wear loose pants you can make it work in your pants pocket as well. There is something special about the gimmick that allows you to pick the right card to blister simply by touch.
You need to be able to force a card, and above everything else you need to be able to sell what you're doing. Performance is key here. You're trying to push some supernatural event, so this needs to be a bit mysterious.
For the price, this is a nice effect that offers something different than the usual card trick.