DESC: The Phiten Titanium Necklace Features:Coated with Phiten's Aqua-TitaniumIts core has micro sized Titanium spheres, as well as Carbonized TitaniumIt can also be worn on the wrist, ankle or waist to quickly relieve pain and stressRecommended for:1. Sports lovers2. Enhancement of athletic abilities3. Fatigue reduction4. Relaxation and refreshment18" - for female, 22"&26" - for male