The Zeta Disc does not need to be pre-heated or chilled for an effective far-infrared effect. They only need to be in contact with the skin. However, by increasing the temperature of the stone or disc, the far-infrared emission will be stronger.
Cold Therapy: Place Disc over ice cube for 30 seconds or longer. Touch Stones can also be chilled in freezer.
Heat Therapy: Submerge Disc in warm water at desired temperature – as warm as you can comfortably tolerate, but no hotter. Submerge the Touch Stone or Disc for 30 seconds or longer.