Produced by:
Concrete factory
Factory available at level 3
Required for construction and upgrades of:
- Fertilizer factory
- Ironworks
- Oil refinery
- Glazier's workshop
- Copper refinery
- Insecticide factory
- Aluminium factory
- Plastic factory
- Lithium factory
- Battery factory
- Arms factory
- Silicon factory
- Electronics factory
- Titanium refinery
- Medical technology Inc.
- Silver refinery
- Gold refinery
- Goldsmith
- Drone shipyard
- Training camp
- Casino
