Yamanni Chinen-ryu kobujutsu, or Yamanni-ryu, is a traditional weapons martial art that originated in Okinawa. The principle weapon used in the style is the roku-shaku bo (six-foot staff), although the sai and tonfa are taught as well. The style has been described as one of the most dynamic and devastating of the Okinawan weapons styles, most probably because of its distinctive wide and flowing strikes, which contrast greatly with the short and choppier movements characteristic of other weapons styles that trace their roots to Okinawa.