ZDP-189 is a stainless steel often used by Rockstead Knives, a company known to make some of the sharpest knives on the market. This is a steel so renowned for its razor sharp edge and durability that it’s used often in high end custom knives. Spyderco, one of the highest rated production knife makers in the business, has also implemented this super steel into their designs. Check out the most popular ZDP-189 knife models below!