Well-cup are made of natural rubber. Based on the Traditional Chinese Medicine (TCM), the cupping technique engages negative pressure rather than tissue compression. Traditional firing has been done away with making the application of cupping easier and safer. Cupping has a great penetrating effect. This has improved efficiency. When the pressure is released, the cup regains its normal shape which leads to negative pressure in the cup, which creates suction. This negative pressure lifts up underlying tissue instead of pressing down on it, as is usually done in massage.