The Classic Pet Michel Tisserand Diamond Straight Shears are high quality Japanese 440c stainless steel. High carbon content makes them very hard. Rockwell hardness of 58hrc ensures longer lasting edges: years of professional use before needing sharpening. Plasma-coated "rainbow" finish increases the hardness and performance Hollow ground and frozen tempered. Fine razor edge and concave blades. Self Adjusting Tension Screw allows user to adjust the tension from soft to firm which results in greater ease of use. Plastic insert ring. Comes in a beautiful felt box. Lifetime guarantee against manufacturers defects and first year free sharpening service when sent back with copy of receipt to Classic Products. Hand made in a factory that has over 60 years experience. True let-handed shears with blades reversed. Triple Ring Shear gives the user greater control and the ability to palm the shear in case of fatigue. The Swivel Thumb Shear offer greater control and aids in prevention of carpel tunnel syndrome.