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Hishi are the seeds of the Japanese waterchest nut.
Used by Ninja as a natural occuring form of Makibishi (caltrop) that could be dropped and not appear out of place in a natural environment.
When dropped one spike always remains point upwards.
The Hishi come in sets of 5 in a pack.
These are genuine seeds and as a natural product come in a variety of shapes and sizes.
A very hard to find item.