Casio Men's G-SHOCK Metal Covered Model GBM-2100-1AJFProduct Highlights Since its launch in 1983, the G SHOCK tough watch has been evolving relentlessly in pursuit of unwavering strength. Introducing the GBM 2100, a metal covered model that maintains the slim size characteristic of the 2100 series while incorporating smartphone link and Tough Solar features. The octagonal form of the 2100 series remains intact, but with the addition of a metal bezel equipped with smartphone link and Tough Solar