The Black Box Chain Bracelet is the perfect way to add drama to your look. This design features a black box chain with extender and disc charms at the closure. From our Bracelet Bar. Lobster closure with extender. Dimensions: 7.5" + 2". 70% brass, 15% zinc, 5% steel, 5%glass, 5% cubic zirconia. Custom designed exclusively for Chico's. Handcrafted with nickel-free metal.