Model cut stone tunnel portals on your OO/HO scale layout.
Colour with Earth Colors™ Liquid Pigments.

Outside: 6 1/16 in w x 5 3/16 in h (15.3 cm x 13.1 cm)
Inside: 2 3/4 in w x 3 3/4 in h (6.98 cm x 9.52 cm)