Material 925 sterling silver, which is an alloy made from 92.5 percent silver and 7.5 percent alloy. The reason sterling silver requires the mixture of other metals is because naturally, pure silver is soft. Our 925 sterling silver jewelry are nickel-free, lead-free, and hypoallergenic. Chain 18"+2" chain, adjustable 2" extension chain for adjusting chain length according to wearer's height, 1MM wide, crafted from Pure 925 sterling silver. Package Free jewelry gift box for easy gift-giving. Free jewelry polish cloth, polishing your silver jewelry regularly to keep it looking its best. How to keep your 925 sterling silver jewelry look its best? Polish your silver jewelry regularly using a non-abrasive soft cleaning cloth(Products include a jewelry cleaning cloth), or with lukewarm water. Gently brush it clean and then rinse it in clean water. To remove caked-on dirt, let it soak for 10 minutes in lukewarm soapy water. Gently brush it clean then rinse in clean water. For a shinier surface, polish with a cloth and a cleaning solution.Do not expose jewelry to chemicals. Silver is given detail through oxidation. Exposure to harsh chemicals can alter the appearance of your Soufeel products. These chemicals include, but are not limited to, Liquid Silver Polish, Pools, Hot Tubs, and Spas. Oxidized silver and pearls are easily damaged. Water itself does not damage sterling silver, it’s the chemicals in the water that can cause it to change color, so never wear your sterling silver jewelry in a hot tub, mineral spring, swimming pool, or any other chemically treated water.When you are not using your jewelry, avoid exposing it to direct sunlight as well as harsh substances like chlorine. Store them in a cool, dry place, a jewelry box(product include a jewelry gift box), a zip-lock bag, or an individual cloth pouch to help prevent both tarnishing and scratching.