This is the Cupid Extractor 1600, aka "The Joker Knife", as seen in Christopher Nolan's The Dark Knight. Also, a special shout-out to the good folks over on therpf.com who were the ones to identify the specif model of knife used in the movie. For more info on where to buy this and other details, check out my website: http://www.discjunkie.se/index.php?box=344