Materials: Polymer Clay All clay jewelry by Romi clay designs are hand made with polymer clay, and therefore each piece is unique and may vary from the pictures shown. All earring posts are nickel & lead free, hypoallergenic, and come with additional rubber backings. Polymer clay is a fairly durable and easy material to take care of, however please do handle with care. Avoid heat. They can be cleaned with a damp cloth if stained, avoiding the metal parts. I please don’t hesitate to contact me for any requests/questions regarding listed earrings. Happy Shopping!