Size: Diameter 11.5-11.9mm Inner circumference: 17.0cm Terahertz ore is a silvery power stone similar to Gibeon and hematite, and it is said to emit a frequency that vibrates approximately one trillion times per second. Terahertz waves are a type of electromagnetic wave, emitting long wavelengths between 1 trillion Hz and 100 trillion Hz, with wavelengths between 3μm and 1000μm, possessing properties of both light and radio waves. It is attracting attention as a stone that promotes beauty and health by promoting blood flow and relieving stiffness due to its vibrations. According to NASA, these terahertz waves are "transmission wavelengths" that penetrate materials and reach human cells, thus having an activating effect, and are currently being researched worldwide. Combined discounts are available from the second item, with a discount of 200 yen per item. 2 items purchased: 200 yen discount 3 items purchased: 400 yen discount 4 items purchased: 600 yen discount Thank you! 5200