Size: Diameter 40.8-41.1mm Weight: 192g We recommend rolling it around in your palm like a walnut. The appraisal certificate does not match the weight. After 300 million years of geological fire, Yakuo Stone has a strong magnetism and is unique. Its unique health benefits that regulate various functions of the human body are gradually being discovered, and it is called "Yakuo Stone". 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 for your understanding!