A Japanese made medium-carbon, high chromium stainless steel, which offers a good balance of toughness, edge sharpness and corrosion resistance.
The monolock mechanism is basically a locking-liner on steroids. The knife liner is one in the same as the knife handle, and thus it is designed and made to function as the locking mechanism. Subsequently, a thicker material is used to provide enough surface area to be a functional handle, and in turn creates a larger surface area to lock the blade with. If executed properly, the monolock design rates very highly in strength and function.