Knives

A Knife is a small single bladed tool used for cutting things with. A knife has come to be seen as a eating tool, but it can be used for many things. Because of their size, they are easily concealled and can be used as weapons for fighting with.

One Piece
Sanji has been seen using knives as well as caling them a cheif's soul. Buggy is also a frequent users of Knives.