All my ear backs are nickel free. Nickel is very irritating. Niobium wires are the best for the most sensitive ears and I use a variety of colors - gray, black, silver and antique copper. Sterling silver, Argentium and hypoallergenic steel are also great for sensitive ears. Some I hand make, and others I purchase locally (niobium, ear clasp and kidney shapes). The studs on my wood earrings are titanium.