Whatever GF9 uses to print/cast these, it's solid stuff with good weight. These will not shift if someone bumps the table.
The design/style is fitting with BT or pretty much any other near-future 6-8mm scale game. The painting is pretty basic, but table-worthy for most. I'd suggest giving the buildings a quick oil wash to bring out the detail a bit more, and/or adding just a little more detail.
They come with, but are not attached to, hex bases. In a very nice touch, the buildings have felt on the bottoms to keep them where you put them.
All-in-all, highly recommended and can look even better with a little wash.