Haci Magnetic Acupressure Suction Cup uses minus pressure principle. When using, pinch needle theca, lie magnetic needle on the skin, thus the needle is fastened on the body, not piercing in the body. Haci Magnetic Acupressure Suction Cup has the function of traditional acupuncture to stimulate points using several or several dozens of needles at the same time. www.rightbestmedic.com