Introducing the sleek and stylish slim G-STEEL GSTB400 models, now available in captivating new color variations. These models boast innovative designs that have been made possible by the inclusion of a thin module and the carbon core guard structure. Among these models is the sophisticated GSTB400D-1A, featuring a stainless steel bezel and bracelet for an added touch of elegance. Through relentless advancements in technology, the GSTB400 has achieved even greater miniaturization of its components and module thinning, all without compromising its Bluetooth or solar functionality. Furthermore, power consumption has been significantly reduced, ensuring efficiency and longevity. This remarkable timepiece also showcases the carbon core guard structure, which not only enhances durability but also contributes to its status as the thinnest G-STEEL Series model to date (as of Apr 2021). With a thickness measuring a mere 12.9 mm from the back cover to the bezel top, this watch surpasses the GSTB100 model by more than a single millimeter. Embrace the perfect blend of sleekness and resilience with the G-STEEL GSTB400 series.