This niobium ear wire features a bright copper finish and is naturally hypo-allergenic. The generous inside loop (2.8mm) allows you to add drops and dangles to create a wide variety of unique designs. Niobium is a reactive metal that takes on a variety of brilliant colors when exposed to various levels of electrical current. This smooth and lightweight ear wire features a loop for attaching drops and dangles. It's an ideal starting point for a wide range of earring designs.