GST-B200X-1A9JF is one of the G-STEEL watches that has Carbon Core Guard Structure. The watch employs carbon bezel to make the watch even much tougher and lighter. It has clear sapphire display glass which is strong to scratches. The case material is light like resin but way much tougher thanks to a carbon inserted material called “Fine Resin ” is used for the case. Another remarkable point of the GST-B200X-1A9JF is that it has a downsized case compared to the former GST-B100X series. Compared to the GST-B100 Series, the 12-6H is 4.8 mm thinner, while the 3-9H is 4.6 mm thinner. The watch features some of the most advanced Casio’s technologies. To mention a few, it has Bluetooth smartphone link function to keep the watch always accurate. It has the Tough Solar system, solar powered movement so advanced that even the weakest light sources are sufficient to operate the watches. FEATURE G-STEEL Shock Resistant 20Bar Water Resistant Tough Solar G-Shock Connected Carbon Core Guard Japan Domestic Market Model SPECIFICATION Glass Material: Sapphire Glass Case Material: Carbon/Resin Band Material: Resin Movement: Solar Battery Size (H×W×D): 53.3×49.4×14.3mm Weight: 83g Release Year: 2019