These scissors are made of 440C Japanese stainless steel for high quality and to keep the scissors sharper much longer, thin hair with sharp razor edge blades and hand-sharpened thinning edges, will not damage or split hair ends.100 percent stainless steel for high quality and longevity. Blades are convex hollow ground for improved razor edge retention; thinning contains teeth on one blade and a smooth razor edge on second; includes removable rubber handle inserts to fit any thumb and finger. Holds easy-to-use spring leaf tension adjustment system with knurled knob.