Casio G-Shock Standard Digital GM-6900-1 GM6900-1 200M Mens WatchCasio G Shock Standard Digital GM 6900 1 GM6900 1 200M Men's Watch The metal cover rests on tiny protrusions on the outside of the inner resin case to reduce surface contact between the metal and the composite material. It reflects the philosophy for the hollow case design structure, protecting the module using point contacts which cushion impacts from the exterior and reinforced further with fibre glass for increased strength. Together, they deliver