Casio G-Shock Carbon Core Guard ALL Black AP CasiOak Watch GA2100-1A1DRCasio G Shock GShock Carbon Core Guard ALL Black AP CasiOak Watch GA2100 1A1DR Carbon Core Guard structure Ever since the first DW 5000C went on sale back in 1983, G SHOCK has continued to push the limits of timekeeping toughness while creating new and original designs. These new models embody these efforts in an attractively thin configuration. These new models inherit the octagon form that was also employed for the original DW 5000C. Analog digital