The first samurai sword were actually was straight bladed, single edged weapons imported from Korea and China, known as chokutō, which were later replaced with a curved blade at the end of the 8th century. The name of the curved blades of swords which replaced them was Tachi. The reason for this transformation was samurai found that a curved sword can be drawn from its scabbard more fast and provided a much more efficient cutting angle.
At the top of the samurai sword point called Kissaki. This is the hardest part of the sword, to polish and forge ahead and create a quality one would require an extremely skilled craftsman. The value of the sword is largely determined by the quality point.
Samurai would also use wooden swords (Bokken), in practice, for security reasons and in order to maintain their real swords from unnecessary damage.
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