Phiten X100 Leash Model Titanium Necklace Woven with High Grade 66 Nylon: This 20-inch sports necklace is constructed with woven black nylon over an elastomer core, pulling to a sleek metallic stainless steel clasp in the front. It's permeated with our highest concentration of X100 Aqua-Titanium and embedded with Micro-Titanium Spheres and Aqua-Titanium Silica using our unique technology that helps to promote relaxation and mobility. In other words, our titanium necklaces are a fashionable sports accessory intended to help relax your muscles during and after your toughest workouts, and we've perfected the method for infusing titanium into our premium workout gear for you. Not only have we perfected it, we have over 100 patents for our unique method worldwide. Look good, feel great, and conquer every day with Phiten's specialized titanium workout gear made for men and women of all ages, activity levels, and lifestyles.