HSK #24 25mm Black Tourmaline Ceramic Barrel Hair Curler 100% Solid Tourmaline Ceramic Barrel. Of the hundreds of hair stylers available on the market, only a handful offer solid Tourmaline Ceramic Barrel. Nearly all use metal plates coated in a thin layer of ceramic. 100% solid ceramic is the only material that provides the highest hair protection from frying and burning your hair. The KOR Ceramic Irons is 100% true, solid ceramic. It's plates will never peel or chip or expose your hair to damages like irons with metal plates , ceramic plated or ceramic coated irons. KOR irons features the best possible heat distribution and retention. Solid ceramic plates also have 100 times more negative ions than ceramic-coated plates. Why is that important for the health of your hair? Damaged hair is positively charged - from static electricity, chemicals in styling products or use of metal-heated hair tools. the positive charge keeps hair follicles open, dried out and brittle. Negative ions neutralize the positive charge, closing hair follicles and smoothing the hair shaft. They actively condition the hair and shine it, while eliminating frizz and static. The result is hair that is shinier, more nourished and healthier than before. That is why KOR heat is healthy heat.