Usuba Japanese Knife 150 mm The origin and material are unknown, but I was told it's from Tosa, Sakai, or Sanjo. This Japanese knife is perfect for peeling vegetables (katsura-muki). I was told it's not a pressed product, but a single item made by a craftsman by hand. It has been stored in a warehouse for a long time, so there is rust and dirt, but it is unused.