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Hi there, the external surface materials include titanium with physical vapor deposition (PVD) coating in Gold, Silver, Rose Gold, and Brushed Titanium colors. Titanium with Diamond-like Carbon (DLC) coating in Black and Stealth colors. The inner surface materials include a non-allergenic, non-metallic seamless inner molding. This is a medical grade, BPA-free inner surface. The LiPo battery, like many lithium-based batteries, may contain small traces of nickel. However, the battery is sealed within a water resistant mold and will not come into contact with your skin.
Sorry, there was a problem. Please try again later.I have metal / nickel allergies. I purchased the Titanium ring so I would not have reactions. I have had reactions to gold and platinum before. I have owned mine 23 days and ZERO reaction
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