Red and Black Titanium Magnetic Therapy Sport Power Performance Energy Necklace Red and black titanium 100% silicone cord necklace Magnetic Clasp provides easy on and off 5 mm( 3/16th inch) diameter and 19 inch long, necklace or wrap and use as anklet Unisex: great for men, boys, women, girls, could provide protection from electro magnetic fields such as your computer screen