... PTC heater, ceramic plate, aluminum plate, coating ceramic paint, teflon, ion power,tourmaline. Classify by materials of the straightener plate.TypeSpecialtyExcellenceshortcomingOthersAluminum plate coated with Teflon ... powder, tourmaline powder can be added to the coatAluminum plate oxygenatedAluminum plate is oxygenated on surfacelower cost, fast temperature risingColor is not ...