Shihara

Shihara is a wooden katana owned and used by Kantaro Matsunaga, given to him by an old swordmaster. The sword looks like a real katana that is entirely colored black. However, despite its appearance, it is completely wooden. As such, when used under normal circumstances, the sword is unable to cut and deals only blunt impact damage to those it strikes. However, the specialty wood used to make the sword is chakra-compatible and capable of altering its structure to benefit its user. When used in conjunction with the {{Samurai Saber Technique]], it can now cut into its opponents and has increased durability. However, if something with a greater force strikes the sword, it can be cut or broken, though it slowly rebuilds and becomes harder as chakra is fed to it. Kantaro only uses the sword to gauge his opponents or train, and only finishes them off with it if they are of little threat. If they are worthy adversaries, he'll switch to a traditional katana instead.