These earrings are made using authentic Japanese glass Miyuki Delica beads and nylon beading thread and are finished off with 22K gold plated surgical steel hypo-allergenic earring hooks and plastic earring backs. Use a gentle jewelry cleaner or a very mild soap and water solution to clean your earrings. To keep the colors vibrant, you should minimize exposure to water, perfumes, and alcohols, and store out of direct sunlight, preferably in a jewelry bag, box, or jewelry organizer.