This is a basic、 standard Japanese sword made for use in Iai.Z-Alloy is the special alloy developed by Takumi-toubo for their line of sword replica.It is recommended to pick the length of sword according to one's height.I.e: the optimal length of sword for a person of 150cm in height is 67cm (2寸2尺). However、 this also depends on your style or school、 so please remember to consult your Sensei or email us through the contact form on the bottom of the page!