The earrings are made of ABS acrylic bead with rhinestone and polymer clay. They have steel posts. Don't let the front of your ear lobe get all the attention. These doble-sided studs will make you look elegant and chic as ever. It's a trendy way to turn classic earrings to a glamorous and sophisticated appeal. The earrings are perfect for any occsion, from the office to date night or a formal event. They are a great choice for any day of the week. Would also make a fantastic gift for your loved ones, friends and family. Size of the earrings approx. 8 mm and 16 mm