I purchased these items during my visit to Tamagawa Onsen: * Tamagawa Onsen Eco-bag * Pink mat * Blue mat I used them for about an hour at the outdoor rock bath on that day. ■ Effects of Tamagawa Onsen's Rock Bath It is believed that the strong radium (natural radiation) and the thermal effects of geothermal heat can improve immunity, activate natural healing power, promote blood circulation, and detoxify the body. In particular, the "hormesis effect" is expected to stimulate the body with a small amount of radiation, activating cells and promoting metabolism. Therefore, it is a rare therapeutic spot nationwide, visited by many cancer patients and people with chronic diseases.