These patches are for students who practice WJJC Kobudo (study of the traditional Japanese weapons). The patch corresponding to the level achieved has to be stitched on the Gi. Weapons require good skills, so they need much time to achieve a medium level of manipulation. This path is very specific and is not for everyone. WJJC Kobudo syllabus includes: Nunchaku, Sai, Tonfa, Jo, Bo, Stick, Kama, Naginata, Katana, Knife and Tessen.