They look like printed tiles from World Works...... i really like them but they take a lot of time to print, build, and then set up. I once had a pretty extensive set of tiles and terrain by them and had rack for four 2x4 frames to pre-build and transport on builds on to and from the shop.....However, storage and transportation got to be too big of an issue. If you have a dedicated game room, garage, attic, etc. I think they are great. I have since mainly switched over to 15mm, 10mm, and 6mm for most of my games...
Skipper