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A concrete compound that is used to build heavily fortified structures.
In-game description

Concrete Materials are an expensive building resource in Foxhole. They are used to build Concrete Structures, such as Tier 3 Trenches and Bunkers, as well as the Storm Cannon.

They can be obtained by refining Components at a 10:1 rate in a Concrete Mixer, which will produce Concrete Materials. Inside the Concrete Mixer is the only place Concrete Materials will stack, and they cannot be crated.