Concrete Blocks are a craftable building material that is very durable. Zombies can still break it, but it will take a lot of time since it is one of the stronger building materials in the game. Hitting the block will yield 25 Cobblestone Rocks in total. All concrete Blocks have the same stats.
The Concrete Blocks comes in a number of different varieties, each with the same durability and features. The only difference is the shape and hit boxes, which may allow you to shoot through them or walk up them. There are rare cases, when a variety has different properties, see Notes below for specific information.
Concrete blocks cannot be crafted directly; instead 10x concrete mix must be used on Cobblestone Blocks to form Wet Concrete. Wet concrete will require approximately 15 minutes in real time to convert to a concrete block.
Concrete Blocks can be upgrading by using 10x concrete mix on Concrete Blocks.