Casio releases two MT‑G models that combine carbon‑fiber laminate frames with stainless‑steel bezels, AI‑tuned shock protection and Tough Solar power. The B variant is lighter and red‑accented; the BD version adds a layered composite band and a higher price tag.
What’s new
Casio’s premium MT‑G line expands with two Japanese‑only models – the MTG‑B4000B‑1AJF and MTG‑B4000BD‑1AJF – both built around a carbon‑laminate chassis and a stainless‑steel bezel treated with Black IP coating. The watches debuted on May 15, 2026 and are now purchasable through Casio’s domestic network.
Construction and design
The core of each watch is a carbon‑fiber/ fiberglass laminate that is pressed into a three‑dimensional shape, effectively defining the whole case profile. A stainless‑steel bezel wraps the frame, finished with a mix of hairline and mirror polishing before receiving the Black IP treatment for extra scratch resistance. The case back is produced by Metal Injection Moulding (MIM), which yields tight tolerances and a solid protective shell.
Both models share the same dimensions – 56.6 × 45.3 × 14.4 mm – and feature anti‑reflective sapphire crystal, a screw‑lock crown and Neobrite luminescence. The main visual difference lies in the straps:
- B variant – resin band with vivid red stitching that runs through the carbon frame and dial. Weighs 112 g.
- BD variant – “Layer Composite Band” that alternates stainless‑steel and carbon‑reinforced resin, also coated with Black IP. Weight rises to 178 g.
AI‑assisted Dual Core Guard
Casio claims the Dual Core Guard structure was refined using AI that digested years of shock‑resistance data. The result is a chassis that meets Triple G Resist certification, meaning it can survive shock, centrifugal forces and vibration that would cripple ordinary watches.
How it compares
| Feature | MTG‑B4000B‑1AJF | MTG‑B4000BD‑1AJF | MTG‑B1000D‑1AJF (reference) |
|---|---|---|---|
| Case material | Carbon‑fiber reinforced resin + steel bezel | Same + layered composite band | Carbon‑fiber resin + steel bezel |
| Weight | 112 g | 178 g | 115 g |
| Band | Resin with red accents | Stainless‑steel / carbon composite | Resin |
| Price (JPY) | ¥176,000 (~$1,110) | ¥203,500 (~$1,284) | – |
| Solar runtime (full charge) | ~5 months (normal) / 18 months (power‑save) | Same | Similar |
| Water rating | 20 BAR | 20 BAR | 20 BAR |
| Connectivity | MultiBand 6 + Bluetooth | Same | Same |
Compared with the older MT‑G B1000 series, the B4000 line pushes the material envelope further by adding a carbon‑laminate core and an AI‑optimized shock structure. The BD’s composite band adds heft and a premium feel, but also raises the price by roughly ¥27,500.
Who it’s for
- Collectors who value material novelty – the carbon‑laminate frame is a first for Casio’s MT‑G range, offering a tactile contrast to the usual resin or full‑metal cases.
- Active professionals – Triple G Resist certification and 20 BAR water resistance make the watches suitable for field work, travel, or sports where impacts are common.
- Tech‑savvy users – Bluetooth sync via the Casio Watches app provides automatic time updates for 300 cities, a self‑check routine and a phone‑finder feature, reducing the need for manual adjustments.
- Budget‑conscious buyers – the B variant delivers most of the high‑end tech at a lower weight and price, making it a sensible entry point into the carbon‑fiber segment.
Pricing and availability
Both models are manufactured in Japan and sold exclusively through Casio’s domestic channels. The B variant retails for ¥176,000 (about $1,110), while the BD variant is listed at ¥203,500 (approximately $1,284). For a broader view of the MT‑G portfolio, see the Casio MT‑G B1000D‑1AJF page.
Casio’s press release and product pages served as the primary sources for specifications and pricing.
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