I tried to find out what they were made from and the best I could ever come with was they may be 1095, W2, or W1 with or without a proprietary mix to ensure the best product for our cusomers.
That being said I have made some good knives from nicholson files and like Robert use one in my shop all the time. It holds a tough sharp edge that has cut many sheath patterns.
Old Log-in name Denim
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Stick with a Hoover original. You'll thank yourself after the hunt.