From the campaign:
The Sci-Fi Corridors line of terrain kits are designed to be used with 28mm scale figures in table top wargaming, RPG games and some board games. Most kits include the laser cut plywood parts needed to make at least 2 corridor or room sections and the rare earth magnets used to join the completed sections. Some kits also contain additional accessory parts such as ladders, markers or doors. A few specialty kits contain only accessory pieces such as extra doors or markers. Kits come unpainted and require some assembly.