I am wondering what the general size is for a usuba for general use is. Looking around sizes I have seen for usubas are around the 180mm to 210 mm. There are other sizes of usuba larger than the size range I have listed like a 240 mm usuba which I haven't seen too many of this size. Is this an issue with using a usuba that is hard to use due to size or is it something that has to do with the usefulness of the blade. Let me know your opinions and knowledge on the subject so I can know what size of usuba checks all the marks of usefulness in performance over the size, and how to pick out one that is at a proper size.