Based on the thin octagonal GA-2100, the GA2100SKE is part of the transparent pack series. It was created using semi-transparent resin parts. This watch features 200M water resistance, carbon core guard base, and a mineral glass face. Size of case: 48.5 x 45.4 x 11.8mmBecause it's a G-Shock, it is shock resistant and built to last a lifetime.