Builders are the primary workforce needed to build new structures and facilities. The first number indicates the builders currently available, the second one shows the total number of builders. You can attract more builders for gold or ask your friends to become builders at your base.
Builders is the main operating force required for the construction of new buildings and structures. The first digit represents the number of available, at the moment, builders, while the second one is stand for number of total workers. You may also attract more builders for gold or hire them from smugglers.