Men's 9 Eye Tibetan Dzi Bead Magnetic Hematite Necklace 20" B Material: Magnetic Hematite and 9 Eye Tibetan Dzi agate bead Enclosure: Strong Black Magnetic Clasp. Color: Gun Metal Black and Size: 1/4'' W(Round Bead: 6mm). L: 20" Surface Gauss: Approx 600 Gauss(Each Magnet)