TohveliusIn marketing speak, it's any stain resistant steel that contains a higher percentage of carbon than common stainless steel grades like 304, etc.
And in answer to your second question, perhaps try Madison Avenue?
TohveliusMost likely X50CrMoV15. Victorinox uses it on at least some of their kitchen knives... these aren't labeled, so it's hard to say, for sure. If that's what these are made of, it's nice stuff. It's a pity the utility knife's serrated; pain in the arse to sharpen.
X50CrMoV15 is the same stuff WÜSTHOF uses. It feels like it's somewhere in between proper stainless, and proper high carbon steels. It rusts, but not quickly, and it turns a darker grey over time. Sharpens up like a razor, and holds a tolerable edge.
It doesn't look like a terrible set, for the money, if you're after an all-in-one set.