Size: 19.5 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 are said to have an activation effect, and research is currently underway around the world on this stone. Please choose a size that is slightly loose, as that is better for blood circulation. 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!