I purchased it at the same time with the main body, but it was good if there was something more entered. Because it is bamboo, frequent replacement was necessary. I think the sharpness is a good product.
I have been using it for a long time but since I can not cut it at all, I purchased a blade. There is no stock in the local home center, so it is saved. Just because it is made of stainless steel or when it is used for heavy objects, the sharpness quickly deteriorates. Also, since the slide screw on the main body side is M4 of "Old JIS standard", the knob nut which can be used as an alternative is not commercially available and it is very inconvenient. It is easy to eliminate female screws and make it a little bigger screw.