| A human hair averages 3-5 micron but can be 8-10 if it is very coarse. It is also one of the strongest natural fibers on earth and the cuticle is one of the hardest. If the edge of the shear is smoother than the smallest hair, then it won't hold it so it cuts clean. If the edge is too fine or the metal too soft, then the hair and cuticle will rapidly wear the edge off. Picking the right edge shape, edge smoothness and metal quality for the kind of cutting and type of hair you do will save you money and wear and tear on your hands. |