They are precast and insulated, they have holes in the concrete/metal studs. They are sealed with urethane caulk in between and they fill a grove on the inside and outside, they have a key.
The walls are bolted together at the top and bottom.
They were developed in Massachusetts I think, for construction during the winter. They are made from 5000 psi concrete so they are waterproof, but our county still makes us put on waterproofing.
You can attach straight to the metal studs.
Took them a total of 3 hours which half was compacting the stone sub foundation.
There is no concrete poured onsite. It has 6” minimum stone.
This video shows the whole process.