Casio G-Shock Special Colors Watch Set GA-2100THS-1A Extra Band Features Introducing new sporty fashion themed model from G-SHOCK, the watch brand that is constantly setting new standards for timekeeping toughness. Base model is the new GA-2100 digital-analog with a blue replacement band that has a red buckle and band ring. This model is as fashionable as it is sporty. Carbon Core Guard Structure A new carbon core guard structure protects the module by enclosing it in a carbon case. The case is made of fine resin embedded with carbon fibers for outstanding strength and crack resistance.