... by chemical elements of 31 sorts,they are Heating Elements:Silicon,Calcium, Chromium, Manganese, Iron, Copper,Zinc, Cobalt, Tin, Boron, Sulphur, Selenium ... , Sodium, Barium,Aluminum, Molybdenum, Antimony, Cerium, Bismuth, Fluorine, Iridium, Nickel, Magnesium, Lead, Carbon4) It wouldn’t make skin singe like old ...