Proto N Scale (1:160) GRS Type D Light Signal, Short Hood. Design to match an available brass signal target, closer to prototypical scale. Due to minimum material thickness required by shapway these targets are thicker than similar brass targets. Targets are scale 24" wide x 36" tall with 8" dia lens opening. LEDs for these are from Richmond Controls. They are 603 size surface mount LEDs with #36 wires attached. A "603" surface mount component has a footprint of 0.060" x 0.030" (1.5 mm x 0.75 mm) http://www.richmondcontrols.com/WIREDLED.pdf.