Terahertz Stone Beads Strands, Faceted, RoundSize: about 3~3.5mm in diameter, hole: 0.5mm; about 115~130pcs/strand, 14.5~16.1 inch(37~41cm).Terahertz is a man-made gemstone that is invented by Japanese scientists in order to protect the body against electromagnetic smog and harmful radiation. What's more, it's an artificial stone called silicon, but terahertz stone has stronger prowess.
