Michel Tisserand's Diamond Line Shears are high-quality Japanese 440c stainless steel. High carbon content makes them very hard, ensuring longer lasting edges. Years of professional use before needing sharpening. Fine razor edge. Self adjusting tension screw allows user to adjust the tension from soft to firm. Comes in beautiful felt box. Lifetime guarantee against manufacturer's defects. Hand made. Plasma-coated "rainbow" finish increases the hardness and performance.