G SHOCK G STEEL GST-B300XB-1A3ER BNIB. The G-Shock GST-B300XB-1A3ER from Casio is made with Carbon Core Guard structure, which makes the watch extra durable. The watch is developed with sapphire crystal and carbon materials, which are characterized by the watch’s light weight and high rigidity, which emphasizes the watch’s robustness.
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