Measurement: 6.5" long with 1.5" extender Materials: -14kt gold filled lobster claw and cable chain ending -24kt gold plate coin drop end -Fine silver overlay round box chain - 4.5mm chain thickness Our Fine Silver Overlay jewelry is crafted using a high-quality brass base coated with an advanced acid gold electro-depositing process, applying 20-30 mils of 99.9% fine silver. This technique produces a durable and long-lasting finish, far superior to basic decorative silver-plated costume jewelry, which typically features 5-7 times less silver. Acid gold plating, originally developed for the electronics industry, offers excellent wear resistance and makes for a great alternative to fine jewelry. For most people, Silver Overlay jewelry is a fantastic, long-lasting choice.