Thank you for your message! Kiwaseisakujo (Kiwaseisakujo) Earring Butterfly Spring Round Plate 9mm G 20 pairs x 2 bags Material: Brass The material is brass. These are spring-type earring findings. Please attach parts with adhesive. You can use rubber covers for butterfly spring earrings, round plate 9mm, for the non-slip part and the part that touches the ear. New, unopened, unused. ✅ Please purchase from the dedicated page within 24 hours of listing. Thank you.