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คำตอบ :	After doing a lot of research on the types of steel and the way it is made, I settled on the mid range steel in this sword which is not as brittle at the higher rated steel but also maintains its edge better than the lower rated steel. This is a nice trade-off for optimal flexibility and sharpness. The sword itself came with a certificate of authenticity, which was a great touch since this made a beautiful gift for my friend. katana for sale http://www.japanesesamuraikatana.com/Folded-Steel-Japanese-Sword-c13270/