Casio Mens G-Shock Master of G Mudmaster Carbon Core Guard Quad Sensor Connected Grey Resin Watch GGB100-1ADescriptionFrom Casio G Shock the innovators of tough timekeeping comes the GGB100 Master of G Mudmaster watch series that has been designed to endure the toughest environments. This watch features a carbon core guard structure case in black with grey accents that allows the internal mechanics of the watch to be protected from shock induced damage. This watch is mud resistant with metal buttons that form a tight seal on the case a dual back cover that