These coils look like the ones from the Wotofo Flow Pro Subtank. They called them mesh-like.
It is like a sheet they punch holes in instead of strands of wire that you see with mesh.
The Wotofo coils were good though albeit very expensive.
It is hard though to keep reviews short. You do want to cover all bases. Well, at least as much as possible and then you start shaving things off because you don’t want to bore the crap out of people.
At least that’s what I do 