Bioceramics Zirconia Ceramic Connector Charms, No Fading and Hypoallergenic, Nickel Free, Coffee Bean, BlackSize: about 10mm wide, 12.5mm long, 2.5mm thick, hole: 3.2mm.Crafted with precision from high-quality Bioceramics Zirconia Ceramic, they are not contain any allergic heavy metals, nickel free. With exceptional stability, they resist fading and tarnishing, ensuring a durable and shiny accessory.