Casio MT-G MTG-B2000B-1A2JF with Dual Core GuardProduct Highlights p> In this model, we have utilized metal, resin, and carbon materials to create a one piece carbon monocoque case that protects the module, introducing the newly developed "Dual Core Guard Structure" which covers the exterior with metal parts for enhanced impact resistance. The addition of a slide lever structure to the metal frame allows for easy band replacement with a new design. On the design front, the metal sides of the case