The Cudeman JJSK 1 was designed in 2013 by Juan Jose Sanchez, founder and Director of the survival school "JJ Adventure". This knife was designed to break the rules of survival. With it we began to include the sharpening stones along with the signal mirror, paracord and firesteel to make fire without the need to carry a lighter in its full version. Its blade has a pronounced notch to scrape the firesteel and spark very easily. The black micarta handle with red spacers fits perfectly in the hand and also has a butt breaker at the end. It keeps the necessary zipper on its spine to guarantee grip while making fine cuts. Its steel is Böhler N-695 capable of perfectly cutting any material that gets in its way. Its black leather sheath with red stitching is multi-position with loops and rivets for both vertical and horizontal carrying and includes the flint and stone adapter. The design of this holster was the initial inspiration for similar holsters such as the Entresierras or Ent models.