Double Shower Curtain Rings Set of 12. 100% pure stainless steel, non-magnetic metal is corrosion-free, meaning it will last indoors and outdoors without rusting. Free gliding action on any shower rods or curtain rods. Use this for Double Shower Curtains: Liner and Decorative Curtains. These are made of heavy Metal not to be compared to the cheap thinner ones sold everywhere.