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