This is the Profi-Plus Scenic Components Gray Brick Wall from Noch. 13-3/16 x 4-59/64'' 33.5 x 12.5cm.
Profi-Plus walls and tunnel portals are made of rigid foam castings that feature exceptional detail. Each piece is cut with a sharp hobby knife or razor saw (sold separately) to fit your scenes. No painting is necessary and components are easily weathered using weathering powders or compatible paints.