Retaining wall blocks (CRB) are modular concrete units that are placed individually to form a retaining wall structure.

CRB units can be laid at angles ranging from 70 to 90 degrees, and typical applications include embankments, attenuation ponds, and cut slopes.

CRB structures are economical to install, thanks to the speed of construction compared to alternative structures. CRB structures vary in price due to various factors, which include:

1. Open-face vs. closed-face installations.
2. The height of the wall.
3. The angle of construction.
4. Accessibility to the work face.
5. The choice of product used.
6. Coloured blocks are more expensive than their grey counterparts.