Size: Size 17 Terahertz ore is a silver power stone similar to Gibeon and hematite, and it is said to be a stone that emits a frequency that vibrates about one trillion times per second. Terahertz waves are a type of electromagnetic wave, emitting a long frequency, between 1 trillion Hz and 100 trillion Hz, with a wavelength of 3 μm to 1000 μm, and have the properties of both light and radio waves. Its vibration is attracting attention as a stone that promotes beauty and health by promoting blood flow and relieving stiffness. According to NASA, these terahertz waves are "transmission wavelengths" that penetrate matter and reach human cells, thus having an activating effect, and are currently being researched worldwide. Please choose a size that is loose enough that it won't fall off. That's better for blood circulation, I think. Combined discounts are 200 yen off per item from the second item. 2 items purchased: 200 yen off 3 items purchased: 400 yen off 4 items purchased: 600 yen off Thank you! ❣️