Even if they are banned in your country, you've probably seen a balisong (butterfly knife) brandished in some movie or other. Such scenes usually show a villain deftly waving such a knife centimeters away from someone's face in threatening manner. If you want to learn how to do that and not get arrested by your local police, the BaliYo from Spyderco could be for you.
This product is essentially a pen shaped like a balisong. Where you'd usually expect a blade is a Fisher Space pen, the writing instrument famously used in space since the 1960s and … Read more