This model is of a curved retaining wall based on the wall at the former Heaton station near Newcastle. It is available in Light Red Brick, Old Red Brick, Light Grey Stone and Dark grey Stone. The curve of the walls is adjustable so you make retaining wall with a variable radius.
If you are ordering this product from outside of the United Kingdom you will need to add International Postage. If you are not sure which world zone you are in check here