Casio G-Shock GRB300EC-1A Gravitymaster Emergency Colors Mens Pilot WatchBuilt to withstand all the rigors of flight, the G SHOCK GRAVITYMASTER GRB300 1A is crafted with a layered construction with a Carbon Core Guard structure leveraging the special properties of a carbon material also used in aircraft fuselages. Tested and proven G SHOCK shock resistance and 200m water resistance (wr 20 bar) ensure the flight readiness of this aviation watch. The Super Illuminator LED light ensures excellent readability no matter the