Great Quantity Discounts on Hypoallergenic Silver (Grey) Niobium Ear Wires! WHAT IS NIOBIUM? Hypoallergenic Niobium ear wires are an excellent choice for people with metal allergies. They are an alternative to Surgical Steel & Titanium. It is highly resistant to corrosion and other reactions, and is used in artificial joints, plates, pacemakers and dental implants. Niobium is a nickel free, lead free, hypoallergenic metal and is considered the best metal for super-sensitive skin. Even when you cannot tolerate silver, gold, platinum or surgical stainless steel, most people with metal allergies can safely wear Niobium.