These earring hooks are crafted from 925 sterling silver with 18k gold plating, stamped for authenticity. The set includes 20 pieces equaling 10 pairs of fishhook-style ear wires. They are hypoallergenic, nickel-free, and lead-free, making them suitable for customers with sensitive ears. Each hook measures approximately 18mm in length and is made from 21-gauge wire. A material quality certificate is included with your purchase.