One of the most appealing features about the original 2100 series was how thin it was compared to other G-SHOCK models. The new full-metal GMB2100 range embraces a similarly thin profile with stainless steel cases that measure 44.4mm wide by 49.8mm lug-to-lug and just 12.8 mm-thick, which makes them the thinnest full-metal G-SHOCK watches that have ever been created. no bluetooth, no solar .The three-dimensional stainless steel bezels undergo a three-step finishing process to create their contrasting brushed and polished surfaces, while the stainless steel middle cases feature screw-in casebacks to help provide them with the G-SHOCK collection’s adventure-proof 200 meters of water resistance.