Profile: Design Concrete Systems Ltd. is specialized in offering noise barrier and retaining wall systems. Retain-A-RockT is a gravity retaining wall system which relies on its mass and interlocking design to provide stability without the use of mechanical tiebacks. Noise barrier walls are used to decrease sound from highways, railways, or to create privacy. We offer anti-graffiti treatments for our concrete products which can be applied during the production process. This eliminates any time period for taggers to vandalize the wall after installation but before the treatment can be applied.