Inner diameter of Terahertz Bangle 60 This is a health product. Terahertz (THz) waves are electromagnetic waves with characteristics between radio waves and light, vibrating one trillion times per second (1 terahertz). Artificial minerals made of silicon that emit this wavelength are popular as health and beauty items. They are expected to promote blood flow, activate cells, and be applied to communication and security technologies. 2480 - Color: Chrome - Material: Metal - Diameter: 60.4mm Thank you for viewing.