This is a set of terrain tiles (6"x6") consisting of what appears to be narrow, rocky pathways that drop off to clouds far below. The actual tiles look like they are photoshopped pictures, so they have a great deal of detail to them, and the 1" grid is present but unobtrusive.
What the set unfortunately lacks is any impression of elevation differences - for a set of mountain terrain tiles, I would expect to see tiles with cliffs going upwards, in addition to the narrow ridges surrounded by clouds that this set provides. The ground in the tiles is very square: everything is at 90° angles, with no curves or diagonals in sight.
If you need the type of terrain in this pack, it's quick and cheap, but the idea has a lot of unrealized potential.