A wooden stick weapon measuring roughly 52 inches in length and one inch in diameter. Length varies with the height of the practitioner and generally is the same as the distance from the floor to the armpit. Diameter can vary slightly and some weapons may be tapered.

For contact work in Tensoku Ryu we standardize on Jo weapons with a uniform one inch diameter. Contact weapons should not be tapered and should have a uniform and consistent diameter of one inch.

Tapered weapons and weapons with a diameter other than one inch may be used for tournament and demonstration purposes but may not be used for contact work.