Black tourmaline corresponds to the "sea chakra", which can strengthen the kidneys and enhance human vitality. This effect is especially obvious for men. Black tourmaline can also absorb and weaken the negative energy in the human body, help people reduce stress and fatigue, and eliminate the disease in the body, which has a positive effect on human health. In addition, black tourmaline can also regulate blood circulation, help sleep, and enhance immunity. This product is hand-woven.