Japan Karate-do Ryobu-kai (JKR) Northern California, Eishinkan Dojois a Cupertino Karate Studio. We practice traditional karate with a focus on children and are dedicated to the needs of our students through the principles of self discipline, respect, focus, self confidence and perseverance. We are a non-profit, martial arts studio with a well-balanced emphasis on traditional karate and competition. In addition to reaching the black belt level, several of our top students are nationally and internationally ranked competitors. For our latest news, see Facebook page: "JKR Northern California -Eishinkan".