Casio G-Shock GA-2000-1A9ER Carbon Core Guard Black Yellow Rubber Strap Men's WatchCore Features of the Casio G Shock: G Shock watches are water resistant up to over 10 bars or 100 meters. The hands and the indices of the models are luminescent. Incredibly durable, the watch is shock resistant, vibration resistant and centrifugal force resistant. Model Specifications GA 2000 1A9ER: This model features a new carbon core structure and comes in black and yellow. A large 48. 7mm diameter shock resistant caseframes the black dial with