A metallic grey color works well for this 16-inch neoprene rubber necklace. This choker-length necklace is 4mm thick. Choose from any of our beautiful line of pendants for your next choice of jewelry component. We select neoprene rubber for a very good reason. Unlike natural rubber, it does not burn or tarnish silver. Check out the other sizes and many other colors available in this great necklace. The neoprene rubber material is latex-free, so it's safe for anyone to wear!