Size: Size 11 Terahertz ore is a silvery 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. It is attracting attention as a stone that has the effect of promoting beauty and health by promoting blood flow and relieving stiffness due to its vibration. According to NASA, these terahertz waves are "transmission wavelengths" that penetrate matter and reach human cells, so they have an activation effect, and it is a stone that is currently being researched worldwide. Please choose a loose fit that won't fall off. I think that's better for blood circulation. Combined discount is 200 yen off per item from the second item. 2 items purchased: 200 yen discount 3 items purchased: 400 yen discount 4 items purchased: 600 yen discount Thank you!