CALIBAR Men's Silver Box Chain Necklace. Calibar is a round-shaped box chain with a graphical pattern of rectangular linked bars in a brushed silver matte finish. Its medium width of 3/16 inch fits most of our pendants, or it looks distinctive on its own. Silver-plated with a brass core for strength and an invisible protective coating to retain the finish. Individually hand polished. Color is real silver. Lobster clasp. Comes in four lengths from 16-22 inches. Matching bracelet is Item #FB83.