GM-2100BB-1A Quartz G Steel Stainless Steel / Resin BlackThe G SHOCK GM2100 models inherit the octagon form what was employed for the original DW 5000C and now feature a steel bezel. Ana log digital timekeeping comes packed into a no nonsense simple design without sacrificing G SHOCK level toughness. High strength, glass fiber reinforced resin, makes it possible to create a case that is a mere 11. 8 mm thin, which is the thinnest among G SHOCK combination models. 200 meter Water Resistance, Shock