G-Shock Gravitymaster GRB300-1A4 Pro Trek Watches These watches start with a

These watches start with a durable exterior design

or navy blue

From super-tough G-SHOCK comes a new collection of GA-400 with a large rotary switch for intuitive operation

the dual back cover consists of a stainless steel panel back and an outer cover made of shock-resistant fine resin embedded with glass fibers

for a more elegant design and a better fit to the wrist

G-Shock Gravitymaster GRB300-1A4 Pro Trek Watches These watches start with aThe GR B300 features a Carbon Core Guard structure, which delivers the shock resistance, rigidity, and corrosion resistance of carbon material used in aircraft fuselages. The carbon fibre reinforced resin case and the seamless bezel design inspired by next generation aircraft come together in a bold and powerful form. Envision the world through a pilots eyes with the flight log memory function for recording current location and time, as well as dual