Togakure Ryu Senban. Originally these items where a carpenters tool called Kugi Nuki (nail puller). Used by Togakure Ryu Ninja for Senban Nagejutsu

Togakure Ryu Ninja would carry 9 Senban at a time

Koto Ryu Koppojutsu also uses an item very similar to these and they are called Teppan.

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