Progressive Knife

A Progressive Knife (often called "Prog Knife" for short) is a combat knife stored in the left shoulder "fin" of an Evangelion which uses it, and is one of the Evas' basic armaments. The blade of the knife vibrates at an extremely high frequency, increasing its cutting sharpness to the point that it can cleave the matter of a target object at a molecular level. Eva 01's Prog Knife is shaped like a simple Bowie Knife. Eva 02's Prog Knife is a more advanced version, which is shaped similarly to a utility knife: if the current blade is damaged or snapped off, a new one will extend from the handle to take its place. No other Evas besides Eva 01 and Eva 02 are ever seen using Progressive Knives.