These rings and sliders are made with jewelry quality metal. No nickel is used. They are coated with a real gold or silver plating over a Zamak base (aluminum and zinc alloy). Zamak is far superior to a steel base, as it does not rust and it reflects the heat of the sun. The silver rings and sliders have an additional varnish coating to prevent tarnishing. The silver rings also features a duller shine than the gold.