Mostly uses stainless steel N690, Elmax, tool steel Sleipner and D2. heat treatment in an electric furnace. I use on the handle different wood, mostly african,stabilized woods, different colored metals, antlers, possibly newer material as Juma, G10,home made Micarta. I use for sheath kydex and mostly cowhide, sometimes snake and another leather. treat leather different oils and waxes.