These Dr. Slick All Purpose Scissors feature tungsten carbide blades that are welded onto the scissor blade frame. Tungsten carbide is 7x harder than stainless steel and holds an edge longer. These scissors are extremely sharp and will handle the toughest fly tying materials, including modern day synthetics. If you’re looking for the strongest, sharpest, and longest lasting fly tying scissors available, look no further than Dr. Slick’s tungsten carbide scissors!