This Super Thick 3MM Round Box Chain will add a modern edge and a cool style to any outfit you pair it with. Made from sterling silver, this Heavy sturdy high quality piece of jewelry is suitable for everyday wear, and will quickly become your staple accessory.Metal - Solid Sterling SilverWidth - 3MMSizes - 16-18-20-22-24 Inch (Size Chart In Photos)Stamp -.925Clasp - Lobster