To many, the Sai has become the virtual symbol of Okinawan Kobudo. A metal implement of the truncheon class, its length is traditionally customized to the practitioner; when held in a reverse grip, the blade should extend approximately 3cm past the elbow.
While generally used in pairs, advanced study involves the use of a third Sai, carried in the belt at the small of the back, specifically for throwing. The tang (yoku) design follows a specific classification, while the pommel (tsukagashira) may vary between round, square, or multi-angled shapes depending on the preference of the maker and the intended usage.
Effective use of the Sai relies heavily on the dexterity of the thumbs, which act as the axis for balancing and rotating the weapon. Power is consolidated through the rapid tightening and loosening of the grip, specifically utilizing the small finger during impact.
In many ways, Sai practice is the armed expression of Shuto (knife-hand) techniques found in empty-hand Karate. It places a significant emphasis on Koshi no Chikara (hip power) and Suri Ashi (sliding footwork). Because the Sai is shorter than the Bo, body movement and closing the distance become vital components of mastery. Advanced practitioners must also master the difficult art of throwing the Sai accurately, despite its significant weight.
Courtesy of RKAGB
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