Might want to check a homeassistant community as well.
I'm guessing your not referring to the screw terminals, because those should have mains voltages in them?
The ribbon that I could see looks like fairly standard gauge DuPont wires, which you can get from Aliexpress (https://www.aliexpress.com/item/1005004647016228.html)
Otherwise, if you need smaller, worth looking at enamel wire. You can get it in lots of sizes, including very fine. Its covered in enamel, so safeish (https://www.aliexpress.com/item/4000580738993.html)
The biggest drawback is that its fiddly and not colour coded, you'll want tweezers to help hold while soldering.