The ThermaJade has two sets of specially shaped rollers carved from natural jade, one each for the torso and the legs, that are mounted in special pivoting carriages. As the warm rollers travel along the entire body they: Relieve stress and promote relaxation; Relieve muscle pain and soreness; Relieve muscle stiffness and ease aches associated with arthritis and; Improve blood circulation. These sessions are 15 or 40 minutes.