Terahertz ore (artificial) is said to improve stiffness and blood flow. It is a mineral said to have a special power that rotates one trillion times per second. Size: Approximately 10mm, 37cm strand. [For Handmade Items] Craft supplies, handmade, DIY accessories, original accessories, handmade parts, materials, supplementary materials, DIY bracelets, DIY necklaces, DIY earrings, DIY piercings, DIY straps, DIY rings, birthstone accessories, etc. Thank you very much!