Interlocking magnetic reef knot clasp is made of "pewter" (zinc-based alloy), then given a rust-resistant imitation rhodium plating to preserve shine. Glue-in ends accept multiple strands of thread, cord and other stringing materials. Standard magnetic strength.
Magnetic>Imitation rhodium-plated>Silver ColoredFindings and Components>Clasps>MagneticImitation rhodium-platedSilver Coloredhttp://www.firemountaingems.com/itemdetails/h20a3120fnH20A3120FNClasp, magnetic reef knot, imitation rhodium-plated "pewter" (zinc-based alloy), 49x19mm knot with glue-in ends, 5mm inside diameter. Sold individually.//image1.fmgstatic.com/images/pa3120fnb(2).jpg8.128.12As Low As $3.64 per clasp