Butterfly Knife
Weight	Varies
Length	Varies
Blade/Head Length	Varies
Edge	Both single and double edged
Users	Filipino Insurrectionist, Macario Sakay, Punisher, Rick O'Connell, The Expendables.

A balisong, or butterfly knife is a Filipino knife with two counterrotating handles with a grove in the center that conceals the blade when the knife is not in use. A skilled user can open the handles extremely quickly, meaning the weapon can be drawn more quickly than a conventional folding knife. For this reason, the Balisong is often prohibited in many countries and US states, much like the switchblade knife. The knife has a stronger point for stabbing, and when thrust into a target, can cause severe damage.