I have a theory that INFI is a steel that is used in other industries and that Jerry bought the rights to be the sole knifemaker to use it. Fallkniven expiremented with it a while before Busse started to use it but they say they did not find it satisfactory. I believe it is the heat treating that makes INFI so special. My SS4 is frankly amazing. I have hammered it through dozens of pieces of hardwood and it was still razor sharp. I was putting a axe head on a handle and scraping some wood when I smashed the very sharp edge of the SS4 into the hawk head several times with no effect other than a chip in the hawk.

I love INFI especially when it has a very fine edge. Why use such a strong steel if you are not going to make the most out of it?