★ Butterfly Knife | Rust Coat

The Butterfly Knife | Rust Coat is a Covert knife. It comes in two wears, Well-Worn to Battle-Scarred, with floats from 0.40 to 1.00. It also comes in a StatTrak™ version, but not a Souvenir one. It drops from two cases as a rare special item: Spectrum Case and Spectrum 2 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. This memento from Siege is still perfectly operational although the exterior surfaces have rusted.