Casio G-Shock GM-2100B-4AER Red Dial Black Resin Strap Men's WatchCore Features of the Casio G Shock Carbon Core Octagon: G Shock watches are water resistant up to over 10 bars or 100 meters. The hands and the indices of the models are luminescent. This watch pays homage to the original model through its retro inspired octagonal bezel. Model Specifications: GM 2100B 3AER The grey case of the watch is made of resin with a stainless steel bezel. A black resin strap secures the watch. The red dial gives the watch its