This is a very valuable stone containing radon‼︎‼︎ CRE+ STONE is a simple and stylishly designed item to support your health. - Brand: CRE+ - Model Name: STONE - Color: Green Thank you for viewing. When drinking water, put the stone in a glass, chill it in the refrigerator, and drink‼︎‼︎ Instead of a glass, it's also recommended to use a shaker, etc., and store it in the refrigerator for immediate use‼︎ You can use it semi-permanently by sterilizing it once a week⭐︎ Sterilization is complete by soaking it in boiling water for about 5 minutes. Radon stone is a rock and soil containing radioactive substances such as uranium, and it is a mineral used in hot springs and facilities where the "hormesis effect" of activating cells can be expected by inhaling and contacting radon gas (weak radiation) emitted from it. This hormesis effect is thought to be useful for improving immunity and natural healing power, preventing aging and lifestyle-related diseases, relieving pain, and alleviating symptoms of atopic dermatitis. ※ Please ask any questions before purchasing. ※ Basically, we do not accept returns after purchase, so please understand. ※ We are committed to a pleasant transaction‼︎ Thank you very much!