Comb Knife

A plastic comb might seem like an innocent enough item to carry around with you but pull out the handle to reveal a 3 1/4 inch blade. The edges of the blade aren't extremely sharp and you wont be doing any slicing with this knife but the point is extremely sharp and can absolutely be used as a stabbing weapon should you be in a situation where you need to defend yourself. However, this particular knife would probably find it's best use in your desk should your hair need a touch up or a letter opened - but that's entirely up to you.