The healing principle behind this wristband is the ancient Chinese art of acupressure. Plastic knob attached to wristband exerts constant, gentle pressure on the P6 (or Nei-Kuan) point on inside of wrist, which is known to alleviate nausea. Because they are drug-free, they may be used alone or in combination with prescribed antinausea medications. FDA cleared for relief of nausea and vomiting associated with morning sickness, motion sickness, chemotherapy, and postop.