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G-Shock

Casio G-shock Carbon Core Guard Ga-2100-4ajf Mens Japan Import

  • Based on 713 reviews
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Availability: Only 1 left in stock, order soon!
Fulfilled by Amazon
Arrives Sep 30 – Oct 7
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Description

CARBON PROTECTIVE STRUCTURE - Since the first DW-5000C went on sale in 1983, G-Shock has continued to push the boundaries of the durability of time while creating new and original designs. These new models embody these efforts in a very fine configuration. These new models inherit the octagonal shape that was also used for the DW-5000C. Analog-digital timing comes in a simple design without sacrificing G-SHOCK level. High strength resin material, reinforced with carbon fibers, creates a shell with a thickness of only 11.8mm, which is the thinnest among the models G-SHOCK.

Package Dimensions ‏ : ‎ 4.61 x 3.7 x 3.19 inches; 1.8 ounces


Item model number ‏ : ‎ GA-2100-4AJF


Department ‏ : ‎ mens


Batteries ‏ : ‎ 1 Lithium Metal batteries required. (included)


Date First Available ‏ : ‎ August 1, 2019


Manufacturer ‏ : ‎ Casio


Product Warranty: For warranty information about this product, please click here


Best Sellers Rank: #348,445 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #1,428 in Men's Wrist Watches


#1,428 in Men's Wrist Watches:


Display: Analog-Digital


Watch Movement Type: Japanese Quartz


Additional Features: Water Resistant


Power Source: Battery Powered


Strap Type: Adjustable


Water Resistance Depth: 100 meters


Sport Type: Walking


Clasp Type: Buckle


Water Resistance Level: Water Resistant


Embellishment Feature: Crystal


Closure Type: Buckle


Style Name: Modern


Shape: Round


Band Color: Red


Dial Color: Black


Theme: Sports


Pattern: Carbon Fiber


Face Style: Modern


Character: Fashion


Brand Name: G-Shock


Model Name: GA2100-4A


Included Components: Watch


Model Number: GA-2100-4AJF


Series Number: 2100


Item Weight: 51 g


Unit Count: 1 Count


Manufacturer: Casio


Age Range Description: Adult


Manufacturer Part Number: GA-2100-4AJF


Band Material Type: Resin


Case Material Type: Resin


Crystal: Sapphire


Case Diameter: 45.4 millimeters


Band Width: 25


Case Thickness: 11.8 millimeters


Bands: 1


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sep 30 – Oct 7

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Amazing watch!
This watch is even prettier in person. I love the color and the material, and of course, the G shock quality.
Reviewed in the United States on August 23, 2026 by Otávio Darissi
    • Excellent
Review Image by Adaisy perdomo
An excellent watch in terms of quality and price. The materials feel durable, it has an eye-catching modern design, and it is very comfortable to wear. It works perfectly and exceeds expectations. Without a doubt, an excellent purchase if you are looking for a durable, attractive watch with unbeatable value for money. ... show more
Reviewed in the United States on July 13, 2026 by Adaisy perdomo
    • You can’t just buy one…
It was a gift for a friend and she loved it. It’s her first casioak and now she’s hooked! I have 6 now. They are comfortable to wear. I like the analog n digital display. If I had to pick a watch to wear for all occasions, this would be it! So many colors and styles. You can buy metal case with resin band or all metal. Can’t go wrong with a Casio! Great value for your money! Quality for sure! Easy to set time. ... show more
Reviewed in the United States on March 18, 2026 by Sophia Nicks
    • Gshock
10/10 looks way better than I thought
Reviewed in the United States on April 26, 2026 by Alex
    • Very nice looking and not too big. Legibility suffers.
This is one of the few G-Shocks that fit smaller wrists. It isn't too big, and it isn't nearly as thick as most G-Shocks. As of now, it is the thinnest G-Shock, due to the new Carbon Core Guard construction. This is a very good-looking watch. Very contemporary and attractive. The good-looking design makes for some legibility issues. The time is fairly easy to see, but if you want the best legibility then this is not the watch for you. Under many types of lighting, all you can see is the little bits of lume paint on the hands. Everything else is red on red on red. The digital display is tiny and is reverse LCD. In order to see it clearly, you have to have your eyes just a few inches away in bright light. If you check the date often, it is far less than ideal. There is a little light between the 4 and 5 indices that you can turn on briefly by pressing a button (using it drains the battery much more quickly). It lights the digital display. If the analog hands happen to be in that area, then it lights them too. If one or both hands is away from that area, then it doesn't really light it/them. This watch has great style and excellent G-Shock toughness and reliability. It fits smaller wrists fairly well for a G-Shock. Unless you demand top-level legibility, then definitely buy one. It is a good-looking watch and an excellent value. ... show more
Reviewed in the United States on December 5, 2019 by PacNW
    • Excellent Casio Watch – Classic and Reliable!
I absolutely love this Casio watch. It’s stylish, comfortable, and very reliable. The timekeeping is precise, the design is classic, and the build quality feels solid. The battery lasts a long time, and it’s perfect for both daily use and special occasions. Casio never disappoints – this watch is a great value for the price. Highly recommended! ... show more
Reviewed in the United States on September 21, 2025 by Maykol Cruz
    • MUI bueno me queda chulo
Es original
Reviewed in the United States on July 7, 2026 by Leonel Abad
    • Great good looking watch
Great product, is a little bit complicated to set te time right, but I love it.
Reviewed in the United States on November 7, 2025 by Jorge S.

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