Rare Blask Silica Bracelet. Black Silica is a rare ore that comes only from Kamino-kuni in Hokkaido, Japan. The black mineral ores deposited millions of years on the seabed, contain far infrared and negative ions, known to promote good health. Infrared rays are used to promote muscle relaxation and to increase blood circulation in our body. Negative ions are said to improve our immune system, increase alertness, concentration and so on. They are commonly found in areas with high level of clean air in the forest or waterfalls.
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