Luminox Black Watch XS.3121.BO.GOLD Pacific Diver 3120 Series Mens features a blackout case that is forged from carbon compound material developed by Luminox called Carbonox. The case measures 44mm in diameter and is light to the touch, because Carbonox is six times lighter than steel, but still extremely resilient and durable. It has a distinctive textured appearance and a bold sharp edged shape, which gives the watch a powerful feel.