*MTG-B4000B-1A2 — Updated May 2025 color!
★★★★⯪
| Size | ★★★★★ |
| Weight | ★★★★★ |
| Functions | ★★★★ |
| Materials | ★★★★ |
| Battery | ★★★★★ |
| Price | ★★★ |
Key Takeaways. The Casio MTG‑B4000 is a sleek, AI‑enhanced evolution of the Metal‑Twisted line: lighter, slimmer, and built with carbon/steel fusion and sapphire glass. It keeps full G‑Shock toughness and smart features, though some traditional fans find its design less bold, and its crown lacks protection. With a premium price tag and mixed styling opinions, it’s a smart pick for those seeking an ergonomic yet robust MT‑G.
| CASIO Price *official | >$1000 |
| Amazon Price *affiliate | *not selling yet |
MTG-B4000 Model Range *may be updated
PROs
Slimmer, lighter profile – At just 112 g and 14.4 mm thick, it’s noticeably slimmer and lighter than previous MT‑G models, offering all the same ruggedness.
AI‑designed structural frame – First G‑Shock using generative AI to optimize strength and shape, combining stainless steel and laminated carbon.
High-grade materials & finishing – Combines laminated carbon/glass fiber, MIM stainless steel, and features Sallaz polishing for premium aesthetics.
Excellent durability – Retains Triple G Resist (shock, centrifugal, vibration) and 200 m water resistance in a svelte case.
Full G‑Shock functionality – Includes Tough Solar, Multiband 6, Bluetooth link, super‑illuminator LED, sapphire crystal with AR.
Ergonomic lug/strap design – Redesigned curves similar to Edifice improve wearability and comfort.
Compact yet strong – Maintains structural integrity despite reduction in bulk — described as practical and elegant .
Premium “Made in Japan” build – Crafted in Yamagata with high-end finishing standards.
Resin band benefits – Combines metal/resin construction with a comfortable resin band for lightweight daily wear.
Innovative lug‑to‑band integration – Frame directly absorbs impact from the strap, enhancing shock resistance.
CONs
Mixed reactions to new aesthetic – Some feel it looks more like G‑Steel or Edifice than MT‑G.
Crown is unprotected – The exposed crown as “odd” and a potential weak point .
Aesthetic opinions vary (many haters and many fans).
May disappoint traditional fans – Some believe it lacks the “wow factor” of earlier MT‑G DNA.
Pricey for resin strap – some feel it’s steep for a resin-band model.
Smaller size isn’t for all – Less massive MT‑G profile may be too subtle for fans of bulkier watches.
Expensive – as usual, you have to pay for premium quality.
*PROs & CONs have been approved and selected by casiofanmag editors, devoted CASIO enthusiasts, who write news and test CASIO watches daily. If you want to add your points, please comment this page and we will review your experience.
General Information
| Price | $1000 *average Amazon Price, we may earn commission from purchases |
| Year of first Release | 2025 |
| Suitable for Wrist Size | 145 – 215 mm |
| Module Number | 5743 / Manual |
| Model Range | MTG stands for METAL-TWISTED G-SHOCK. All MTG watches feature a new core guard structure, where an inner case is housed within a box-shaped frame secured by screws that connect the bezel, case back, and band attachment pieces. This design absorbs shocks through the outer components rather than the core, resulting in a more robust structure. In addition, MTG watches are part of the PREMIUM line, offering top-tier materials, advanced functions, and cutting-edge technologies. |
| Battery Type | CTL920 Solar Powered (G-Shock Batteries) |
G-SHOCK MTG EVOLUTION
May, 2025
MTG-B4000
★★★★⯪
The Casio MTG‑B4000 is a sleek, AI‑enhanced evolution of the Metal‑Twisted line: lighter, slimmer, and built with carbon/steel fusion and sapphire glass.
May, 2022
MTG-B3000
800$ on Amazon →
★★★★
With its even more advanced Dual Core Guard structure, the MTG-B3000 protects the module in a carbon-reinforced resin case and encloses the exterior in metal components.
More →
November, 2020
MTG-B2000
800$ on Amazon →
★★★★
A dual core guard structure is constructed by protecting the module with an integrated carbon monocoque case and covering the outside with metal parts.
More →
July, 2018
MTG-B1000
750$ on Amazon →
★★★★
These watches come with a new Connected Engine module for improved timekeeping accuracy. A Bluetooth® communication function makes it possible to connect with a smartphone running the G-SHOCK Connected* app and obtain accurate time information from an on-line time server.
More →
September, 2015
MTG-G1000
★★★★
This new model is built using MT-G’s original Core Guard Construction and TRIPLE G RESIST, and feature a powerful GPS hybrid radio-controlled solar-powered system.
More →
October, 2013
MTG-S1000
★★★★
First MTG watch with Sapphire Crystal and Alpha Gel inner layer for
Vibration Resistance.
December, 2008
MTG-1500
First MTG watch with Tough Movement feature for module.
November, 2007
MTG-1000
This watch has used composite technology to improve its shock-resistant performance, and 5 powerful motors drive analog indicators that create a new level of measurement in this chronograph with solar power and atomic measurement technology.
November, 2002
MTG-900
G-SHOCK MTG watch with Wave Ceptor for time correction and Tough Solar.
September, 2002
MTG-520
First MTG watch with Solar Power.
September, 2002
MTG-700
First MTG Watch with Digital Display.
October, 2000
MTG-500
First MTG Watch with Ana-Digi Display Indication.
June, 2000
MTG-100
The new stage of shock resistant structure — meet the Metal-twisted Case as combination of steel and resin for better shock absorbing.
Japanese Unique Features in MTG-B4000
The structure and exterior design were developed collaboratively by human designers and AI, creating a bold new frame that integrates carbon fiber and metal materials. Paired with the Dual Core Guard structure, this innovation further elevates MT-G toughness and cutting-edge design. A novel approach integrates band connection parts directly into the frame, effectively reducing shock transmission to the case through a hybrid carbon-metal structure. To further enhance impact resistance, a screwless design securely attaches the metal lug components to the carbon frame, ensuring exceptional durability and resilience.
AI-assisted development processAI-assisted development process
AI was used to analyze and simulate base designs created by human designers. Drawing on the extensive data on shock-resistant structures in the G-SHOCK world, optimized 3D prototypes were generated to meet specified structural strength and material property requirements. These prototypes were further refined via repeated manual adjustments, achieving unique forms that seamlessly combine functionality and beauty.
Multi-layered carbon frame design for a side view exuding strength and beauty
The frame is cut out from a base material consisting of laminated carbon and glass fiber sheets to create its intricate, dimensional form. The beautiful layered patterns created by the pair of different materials are incorporated as a design feature. Configured to interlock with the bezel, side buttons, and case back, it offers a beautiful side view accentuating the combination of materials.
Meticulous metal finishing for a solid luster
Sallaz polishing is applied to certain mirror-polished surfaces to create smooth, beautiful, distortion-free finishes. Separate hairline and mirror finishes applied to individual components accentuate the beauty of the metal with looks of luxe refinement.
Metal injection molding (MIM), a method of metal processing in which fine metal powder is injected into molds, is used to create the intricate dimensional case back.
Newly developed blue-gray IP is applied to the MTG-B4000B.
Multi-layer dial projecting sophisticated refinement
The design incorporating three-dimensional arrangements of components, including a slanted dial ring set off with large, boldly raised indexes, gives the watch an impressive sense of depth. Phosphorescent finish and metallic vapor deposition are applied to the sharp, multifaceted forms of the indexes. Achieved with the fine processing technologies of Yamagata Casio, the intricate forms of the components accent the watch with sophisticated textural appeal down to the finest details.
TRIPLE G RESIST: Passion for delivering further strength
The updated MT-G Dual Core Guard structure protects the carbon fiber-reinforced resin inner case with metal components, delivering high strength and weight reduction at the same time. The innovative construction meets stringent G-SHOCK standards, providing protection from shock, centrifugal force, and vibration with Triple G Resist technology.
Solar-powered timekeeping with Bluetooth® and radio control for enhanced accuracy and reliability
Super Illuminator (high-brightness LED light) for maintaining watch readability in the dark
Scratch-resistant, highly transparent sapphire crystal with an anti-reflective coating
