Moxibustion stone bracelets will turn black when worn, which is corroded by water. Moxibustion stone can be worn for 24 hours, but it needs to be taken off when taking a shower and washing your hair to prevent the necklace from being corroded. Pay more attention to maintenance to make the product last longer. Moxibustion stone is also called rare earth health chain. Chains made of rare earth materials for health preservation can be produced by Erkang family of Xi in China at present. Rare earth refers to rare earth permanent magnet materials. Health preservation is to clean human blood vessels and strengthen cells through the magnetic field characteristics of rare earths, so as to achieve health care. Mainly aimed at blood microcirculation and blood vessel dredging, it has excellent effect on hypertension, blood vessel blockage and cervical pain caused by sedentary.