Handmade in our home in Johnstown, CO. These earrings are laser engraved/cut from different varieties of wood such as alder, maple and walnut. Hardware is made out of hypo-allergenic, nickel-free materials and come with rubber-back stoppers. Each stud is 0.36-0.40 inches in diameter. These studs come in the set of 4 as shown in the pictures.