An Ultra-thin Module Encased In Carbon Fiber Makes For A Stylish G-steel Timepiece With The Slimmest Profile Yet.Strong, Yet Lightweight, The Carbon Core Guard Structure Absorbs External Shocks And Retains Bluetooth Connectivity And Solar Power Functionality Even With Smaller Components And A Thinner Module. Measuring Just 12.9mm From The Back Of The Case To The Top Of The Bezel, The Gst-b400 Is Over A Millimeter Thinner Than Its Predecessor .Your Choice Of Four Distinctive Styles—the Simplicity Of A Silver Metal Band And Silver Case; Light Silver Case Set Against Dark Resin Band; Dial In Dramatic Red Vapor Deposition Finish Paired With A Black Ion-plated Bezel; Or Dial In Bold Blue Vapor Deposition Finish With Black Ion-plated Bezel And Band. With Top Bezels Treated With Five Different Finishes And Middle Bezels Treated With Four, These G-steel Timepieces Deliver Exceptional Metal Textures From Every Angle.* Slimmest Profile As Of December 2020