Construction materials
From Workers & Resources: Soviet Republic Official Wiki
In Workers & Resources: Soviet Republic, you have the opportunity to construct the Buildings, Utilities and Infrastructure all by yourself. For all this construction there are materials required. All these materials can be Imported but it's also possible to produce them yourself, during the game.
Each Construction item has its own blueprint in which the different compositions and the required numbers of construction materials are recorded. All necessary construction materials must be delivered to the construction site according to the blueprint.