All three are made of 1095 cutlery steel, tempered to Rc 54-56. This steel makes a blade that sharpens easily and takes an edge like a razor, but usually requires a fair amount of resharpening. However, these hold their edges like Grim Death itself. Out of curiosity, I cut the top out of a steel acetone can with the Survival Knife. Its edge needed a little retouching, but otherwise it didn't seem to mind.