3/4" Jewellry Quality Sliders in pair. All of our jewellry quality sliders and rings have a real gold or silver plating over the base of an aluminium and zinc alloy, called Zamak. Zamak is far superior to a steel base, as it does not rust and reflects the heat of the sun. This The silver has an additonal varnish on top to prevent tarnishing. Add some bling to your bras and lingerie!