Kizure Thermal Curling Irons are manufactured of the finest blue steel. All Kizure Thermal Irons are 95% tempered and are designed to be used by professional hair stylist. For best results, when working with heat, use Kizure's Thermal Prep line of pre-thermal products to protect and condition the hair effectively. After blow drying, straighten (press) hair with Kizure Thermal Pressing / Texturizing Combs and finish with Kizure Thermal Curling Irons for beautiful, long-lasting style.