These stud earrings are made with clay and gold plated brass. They are minimal and modern, but bright enough to make a statement. They measure: 10mm x 2.5mm. They are made of gold plated brass, clay, and are finished with nickel / lead free, surgical steel posts and rubber backing. They also come in other colors: Speckled White, Black, Aqua Marble, Black+White Marble, and Forest+White Marble.