This kit comprises 4 single & 4 double track culverts.
You will receive 2 sets in brick and 2 sets in concrete. You can mix and match to your hearts content.
The culverts are 38mm high and have wing walls that are 70mm long. The culverts are also 70mm long.
As you can see in the happy snap they do make a great addition do your layout.
The props in the happy snap are not supplied in the kit, all you get is the culverts.