- IDEAL FOR WET AND DRY HAIRS.
- THIS SIMPLE DESIGN OFFERS THE MOST COMFORT AND CONTROL.
- ROCKWELL HARDNESS: 59-61
- LIFETIME WARRANTY
Rockwell hardness testing is a general method for measuring the hardness of metallic materials. In this test, a load is applied to set a diamond cone or a hardened steel ball in the surface of the metal. The hardness is measures by depth of the penetration