Material: Titanium Stainless Steel (316 L) with 3 layers of 18 K gold •Color: Gold •Wide of chain : 3 mm •Chain Length: Adjustable, from 16 inches to 18Inches. I am Titanium, I am healthy and environmental!Titanium is widely used in medical appliance, such as surgery tools. According authority of medical circle, titanium material is in-noxious to human body. It is also radiation-resistant and corrosion-proof. It used to be precious, so it is widely applied in aerospace. The allergic possibility is almost as low as 925 sterling silver, because titanium is safe with skin contact. ShippingItem will be shipped within 1 business days after payment clears.Domestic items will be shipped via USPS First-Class Mail without delivery confirmation. Tracking & delivery confirmation are available ONLY up on request, additional shipping charges may apply.International items will be shipped via USPS International First-Class Mail without Tracking Number.