Silicone rubber Titanium necklace 1.Material: Titanium, germanium, magnetic&anion medical silicone 2.Any colors &sizes Silicone rubber Titanium necklaceMaterial: Made of Titanium, germanium, magnetic and anion medical siliconeLife expectancy: 20 years of material lifePrinciple of products: including titanium, germanium, magnetic and negative ion 4 different materials, it overcome completely the ...