★ Butterfly Knife

The Butterfly Knife is the knife with no finish at all, known as vanilla. It also comes in a StatTrak™ version, but not a Souvenir one. It drops from one case as a rare special item: Operation Breakout Weapon Case.

This is a custom-designed balisong, commonly known as a butterfly knife. The defining characteristic of this weapon is the fan-like opening of a freely pivoting blade, allowing rapid deployment or concealment. As a result, butterfly knives are outlawed in many countries.