The Art and Science of Traditional Shotokan Karate-Do Kata DVD by Master Instructor Ray Dalke. Dalke Sensei has been a student of the legendary Hidetaka Nishiyama for over 40 years and has learned the inner secrets of the techniques the way it was taught to him. This DVD shows you the essence of Shotokan Karate katas; and explains the intricacies of them. No ridiculous bunkai techniques that don't work; just solid information that brings the kata into perspective like never before! Approx. 58 minutes. RS-0039.