New, unused. 8mm, inner diameter 15cm. Purchased from a reliable natural stone wholesaler. I also use terahertz and have personally experienced its amazing effects, such as relief from stiff shoulders! Individual results may vary, but I highly recommend it. Offered at a low price, so no price reduction is possible. Will be shipped in simple packaging. Effects: The cell activation and blood circulation-promoting effects of terahertz waves can significantly improve our health. Furthermore, it can be expected to have a relaxing effect and reduce stress mentally, making it an ideal item for balancing the mind and body. Terahertz is said to emit terahertz waves that cause approximately 1 trillion molecular vibrations per second. It is expected to improve blood flow, activate cells, and promote metabolism. Up to 5 bracelets can be shipped together. If you would like to combine shipping, please contact me through the combined order request. A discount will be applied for combined shipping. 2 items combined: 100 yen off 3 items combined: 200 yen off 4 or more items combined: Discount up to 300 yen, so please request the order with the adjusted price. Please note that if there is a price error, I will not be able to approve the order. The item will be thoroughly purified and shipped in simple packaging. Thank you.