What a powerful combo of terahertz and black tourmaline.Terahertz is a man made stone that carries strong powers and healing benefits to the body.Its thermal conductivity is very high, and can improve your energy flow & blood circulation that may help speed up your metabolism.Black tourmaline absorbs negative energy and is a powerful grounding stone.8mm beaded bracelet with two different sized terahertz beads, giving this a unique look.From china