You are looking at a Girder support in grey PLA with brick/stone feature detail, perfect for OO gauge model railway bridges.
OO Gauge Bridge Support Abutment Pier Model Railway Girder Support Brick Stone
TT120 Gauge Bridge Support Abutment Pier Model Railway Girder Support Brick
2 x N Gauge Bridge Support Pier Model Railway Brick Stone Detail
Hornby OO Gauge Bridge
OO Gauge Model Railway Arches Road Bridge Support Wall Sections Retaining Walls
Stepped Railway Bridge Support Kit. Laser Cut Scenery. Train Piers OO/HO Gauge