Material: polymer clay,14k or S925, or hypoallergenic nickel free surgical steel for post Clean: wipe with a microfiber towel Earring posts are attached with a strong glue and the clay is baked hard. Treat them with care and do not wear them in water to keep them intact. Please note: Price in the listing is for one pair,if you need them as clip on earrings, let me know, i can make them as clip on too,each item is unique, because it's cut from a large slab of clay, and may have small imperfections,there may be a slight variation in each pair. General waiting time:7days return policy: contact me within 3 days for return, not available after 3 days