Made from Niobium. Finish is black, coordinating with Gunmetal findings. Earwire style features a large bottom loop. Hypoallergenic! Will not tarnish, oxidize or change color! Coordinates well with gun metal finish jewelry, especially for those who cannot wear plated base metal wires. Overall size is about 20x9mm, large loop in front is about 4.5mm. Sold by the pair.