Hello, you bought magnet underwear. This underwear has a built-in magnet, which can massage multiple acupoints of the breast, promote the smooth blood flow in the chest, dredge the breast, promote the secretion of female hormones, relieve breast pain during physiological period, and improve breast hyperplasia, mastitis, lump, lobular hyperplasia and premenstrual breast pain. To sum up, it is harmless to human body, so please feel free to use it.