Folsom State Prison is one of the safest, most guarded and most dangerous heavyweight prisons in the suburb of Sacramento, USA. Here, prisoners use a deadly weapon (dagger) rather than fists at the time of combat, without exception. As a result, the knife fighting techniques developed here are far beyond any levels you can meet on the street. Because the situations that these knife fighting skills are about to deal with are much more dangerous than any so-called dangerous situations you met in the street fighting.