Wax wood
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The wood from White Wax Wood (presumably Ligustrum lucidum) saplings has been prized in China for thousands of years. It is an ideal material from which to fashion staffs, spear shafts, and walking sticks, because it is tough, hard and flexible and can absorb shock without breaking. Japanese and Korean martial artists will typically choose a piece of waxwood cut to be 1/2' - 3/4' above their personal height, and which will have a pointed end (toward the top of the wax wood stalk) and a thicker base. The size and weight of the bo staff is determined by how near or far the staff is cut from the tip of the wax wood stalk.
For a demonstration of the physical characteristics of a wax wood staff, see http://www.youtube.com/watch?v=k4iOO1rfBo4