Today, Casio announced a pair of monochrome G-Shocks, combined with a Carbon Core Guard structure and carbon fiber bezel inserts.

The Gravitymaster GRB200-1B measures 54.1 mm x 18.3 mm (80 grams) and features a menacing all-black colorway and the Mudmaster GGB100-8A measure 53.1 mm x 19.3 mm with (92 grams) a two-tone gray and black color scheme.

Like with all G-Shocks, these watches are rugged and highly shock resistant —designed to be used in urban environments, or for harsh professional use. More specifically, the Gravitymaster GRB200-1B is tailored to aviation professionals, with high precision and large buttons for easy operation while wearing gloves. And the Mudmaster GGB100-8A is ideal for those working in muddy, dirty, and sandy environments, and has large texture buttons for slip-resistance.

Updated for 2021, the Mudmaster GGB100 and Gravitymaster GRB200 possess Quad Sensors that provide compass, thermometer, altimeter, and barometer functions, as well as a step tracker, and Bluetooth Connectivity (for automatic time adjustment, world time, mission log, and more).

Each model has a mineral crystal and runs on a CR2025 battery that’s good for 2-years under normal conditions, an on-demand Super LED, 5 alarms, 1/100th of a second stopwatch, and more.

The GGB100-8A retails for $380, and the GRB200-1B retails for $350, both will be available in July at select G-Shock retailers, the G-Shock Soho Store, and Gshock.com.