The performance of a Butterfly Knife is the same as of the Default knife, but it looks much more impressive. Virtual characters play with it while moving around. The possibility to close and open the blade is the main feature of this knife. In CS:GO, Butterfly Knife appeared with the Operation Breakout update and can be gotten from the CS:GO Cases with the same name. A much easier way for dedicated players is to buy Butterfly Knife skins on DMarket.