Stealth Sterling Silver Box Chain 1mmThis Rounded Box Chain is made with Stealth Sterling Silver and is available in 16, 18, and 20 inch lengths. These chains are 1mm in diameter. Clasp type: Lobster The Black Silver or Stealth Sterling, as I like to call it, is made with Sterling Sliver process though patination. I use simple chemistry which speeds up the oxidation process of the silver and turns it black. The black color is not permanent, eventually the object will adapt to the wearer