Butterfly knife
Cost: 5 gp
Proficiency: Exotic
Weapon Class: Melee
Category: One-Handed Melee
Damage: (S) 1d3 (M) 1d4
Critical: 19–20/×2
Range: —
Weight: 1 lb.
Type: Piercing or Slashing
Source: Adventurer's Armory, p. 4
Description
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.