Goldbug Collection’s Large Peanut Stud Earrings Material: 18K gold-plated brass and sterling silver post Length: 16 mm Post Backs Care: To ensure a longer life for your Goldbug pieces, please do not shower, swim, or sleep while wearing them, and keep them away from sunscreens, lotions, and perfumes. To clean your pieces, rinse with warm water and a gentle soap. Like our bug friends, sadly, costume jewelry doesn't live forever!