Model cut stone tunnel portals on your HO scale layout. Color with Earth Colors™ Liquid Pigment.
Outside: 6 3/16 in W x 5 1/4 in H (15.7 cm x 13.3 cm) / Inside: 2 11/16 in W x 3 11/16 in H (6.82 cm x 9.36 cm)
Meets NMRA specifications