Extremely cute Alto Clef C necklace designed for fans’ out there who love music. It is made by our unique craftmanship. Base Material: Sterling Silver Size: 11mm X 25mm Chain length: 18 Inches Metal Stamped: 925 Thickness:1.5mm It comes along with a nice classic jewelry box. This item are Nickel and Cadmium free. Care Guide: When you’re not wearing your sterling silver jewelry, be sure to keep it in a ziplock or airtight baggie as this will prevent moisture from oxidizing it. You can use a silver polishing cloth to remove oxidation from silver and cleaning it right away will make it easier to restore the shine.