Casio GA-2300-1AER G Shock Core 42.1mm Black Hybrid Dial Black Resin Strap Men's WatchCore Features of the Casio G Shock: G Shock watches are water resistant to at least 10 bars or 100 metres. The hands and indices of the models are luminescent with Neobrite coating. Incredibly durable, the watches are shock resistant, vibration resistant and centrifugal force resistant. Model Specifications GA 2300 1AER: This watch follows a monochrome black colour scheme. The bezel and case are both made of black resin. The case measures 42. 1mm in