A modular bored-tunnel liner segment, formed as a short cylindrical ring with a smooth grey outer shell and a ribbed terracotta-toned interior lining. The inner face is divided into curved, bolted panel sections with raised structural ribs, and the ends are shaped to join to matching rings.

The clean engineered form lets several segments be joined into a continuous tunnel bore.

Ideal for building a subway, rail, or road tunnel on a model railroad layout, an underground or infrastructure diorama, or a modern or sci-fi tunnel setting for a wargame table.