Every set of earrings are handmade with polymer clay. Earrings are so lightweight you will forget you have them on! Earring backs are nickel free. Since all items are made by hand, slight variations, imperfections and difference may occur. Store items in a clean and dry area. Do not wear in the water. Earrings are delicate so store carefully so they will not bend or scratch. Any questions, please feel free to message me! STUDS ARE APPROXIMATELY .5"