Cost 5 gp Weight 1 lb.
Damage 1d3 (small), 1d4 (medium) Critical 19-20/x2 Type piercing or slashing
Category light Proficiency exotic
Weapon Group light blades
A butterfly knife has a blade concealed between two halves of the handle that can be brought to bear quickly.
If you are proficient with the butterfly knife (or have the Quick Draw feat) and are holding it in your hand, you may open it as a free action; a nonproficient user must spend a move action to open it. Otherwise, treat this weapon as a dagger. When it’s closed, you gain a +2 bonus on Sleight of Hand checks made to conceal it on your body.
Pathfinder Companion: Adventurer’s Armory. Copyright 2010, Paizo Publishing, LLC; Authors: Jonathan Keith, Hal Maclean, Jeff Quick, Christopher Self, JD Wiker, and Keri Wiker.