Niobium French Earring Wires, Hypoallergenic, Yellow gold niobium, earring hook findings Niobium French Ear Wires - Yellow Gold (great for gold, warm tone jewelry) Medium thin wires are 20 gauge, 20mm long 10 pieces (5 pair) inh pack. Use for new jewelry or to replace other ear wires Niobium is an inert metal. Resistant to corrosion.Nickel Free, lead free, cadmium free. Made in U.S.A.