This is the Casio G Shock Mudmaster Black and Silver Watch GWG 2000 1A1. Take on the toughest terrain with the G SHOCK MUDMASTER, designed to handle the harshest, roughest on land environments. This shock resistant watch is constructed to withstand all the mud and sand your adventures may bring, and it leverages our latest exterior technology to deliver a smaller profile with an even better fit. This compact design is made possible by the forged carbon bezel, carbon core guard case structure, and mud resist buttons combined with stainless steel pipes and silicone buffers. Finely powdered carbon fiber is kneaded into resin, then heat pressed to mold a bezel that is more complex, yet even stronger than before.