Casio Octagon Series G-Shock Carbon Core Black GA-2100-1A1 Men's WatchModel Specifications: GA 2100 1A1 The black case of the watch is made of carbon reinforced resin. A black resin strap secures the watch. The black dial gives the watch its high tech appearance. The model also features a digital display. A hard glass mineral crystal encases the dial. Amongst the many functions featured on the watch are alarms, a day and date, an LED backlight, a dual time and a stopwatch functions alongside a world timer. Movement Type