The new 22 Inch PHI-TEN MLB Authentic Team Gear X-30 Titanium Necklace contains 30 times more AQUA-TITANIUM, which is water-soluble titanium produced through our Phild Process technology. The outer material is 100% Nylon and the core is 100% Elastomer Rubber (Titanium Compound). The PHI-TEN MLB Necklace is made in Japan and distributed by PHI-TEN USA, Inc.