- Material: Cobalt - Size: 5.5 inches I am selling this item because I haven't had much opportunity to use it after purchasing it. There are no chips or defects, and it has never been sharpened. It can be used as is without any problems, but if you are concerned, you may want to sharpen it before using it. I purchased it for 50,000 yen as a favor. This is recommended for those who want to try one. * Returns are not accepted for used items. * Price negotiations are welcome / Immediate purchase is welcome.