Size: Diameter 8.5-8.8mm Inner circumference 16.0cm Shungite is a rare natural stone found only in the Republic of Karelia, Russia. It is named after the place name "Shunga" in the Republic of Karelia. It is a mineral that has gained worldwide attention for containing fullerenes, which are said to neutralize active oxygen. Shungite is the only stone on Earth that contains natural fullerenes (C60 carbon fullerene). C60 carbon fullerene molecules have electrical conductivity and useful properties as a material, leading to applications in medicine, beauty, cosmetics, electronic materials, and more. Shungite is also said to have the effect of enhancing natural healing power. There are experimental results showing that it slows the growth of cancer cells, and its hidden power is still an amazing stone with many unknowns. We offer a discount of 200 yen for each item from the second item purchased. 2 items purchased: 200 yen discount 3 items purchased: 400 yen discount 4 items purchased: 600 yen discount Thank you! Please note that as it is a natural stone, there may be some scratches or minerals included.