When we got married, someone gave us a picnic set that had an Opinel knife in it. That was lost years ago, but a few months back, I saw Opinels in the case at GOPC. I picked up a medium size one not to carry, but for a kitchen knife! It is carbon steel, and develops a patina if you cut acidic things like tomato or lemon with it, but the patina protects the blade. I got the "carbone" because with just a few swipes on the stone it gets razor sharp. Not even my good chefs knife can cut a 'mater like that Opinel. Plus, it is quirky, a wooden handle, with a rotating steel lock collar. Neat knife.