Busse-Kin knives all have good steel, but still keep in mind a cinder block and a rock are pretty hard and will normally damage the edge. I purposely cut a brick in half with my Scrapper 6 and there was a small chip or two in the edge. I originally thought the miracle steel could take it and laugh but then realized that most steel would show major damage and the S6 barely had any. I just sharpened the damage out and kept on truckin'.