... The Far Infrared (FIR) Sauna Wrap PH-2BIII is a low-voltage FIR device, with 3 separately ... of high-efficiency heating element.The heating element is made of carbon wire that can produce much ... wire. Besides, carbon wire is light, durable and foldable and uneasy to break. ,what is more ,the carbon firber ... wire can produce Far Infrared Ray .4. The cover is made of ...