G-Shock Watch Premium MT-G Alarm Chronograph MTG-S1000BD-1AER. The G Shock MTG series showcases exceptional durability achieved with the highest quality materials. The watch casing has been developed into an extremely durable core guard structure crafted from resin and stainless steel, framing scratch resistant Sapphire Crystal. Finished with Sallaz polishing, this stunning timepiece strikes a rare balance between strength and beauty.