Our infrared appliances and devices use a special ceramic we call tourmaline ceramics. This ceramics is a composition of natural components such as Tourmaline, Germanium, Lava and granite. These components are crushed into a powder and poured into small round or hexagonal molds. These are then burned in an oven at 1,300 C and become ceramics.
This ceramics are among other things, characterized by a high emission of infrared heat waves in a specific area of the infrared area of the electromagnetic spectrum.
Infrared rays can not be seen, but we can feel them as heat. For example, the heat we feel from the sun, or a hot tile stove, infrared electromagnetic waves.