Hi, Extrema Ratio (Last Resort) is an Italian Company that focuses on "tactical" knives with input from various military units. The Rao is an interesting knife that is a folder but can be turned into a fixed blade by inserting a threaded pin. The pin is attached by a "shock cord". I like the sheath as it can carry the knife as a folder or extended, can be carried as a fixed blade. The attachment by "shock cord" not to my liking. This is a big knife that with sheath weighs 16oz and open is 10.5". It is made from Bohler N690 with an "anticorodal aluminum" handle.(anticorodal?). This was not an easy knife to find and I originally wanted the RAO, original. The original has a "Tanto" style blade. The weight to usefulness ratio made not be to everyone's taste. It's not a Randall but I think it's interesting, regards, Mike