From the website:
Prepare for Battle!
These maps expand the Battle Station facility to reveal the barracks, armory, and weapon testing range of an elite military force, and the service depot that delivers equipment and other provisions to the base from below.
The Supply Deck also connects seamlessly via a railway line to the Mass Transit series, allowing both sets of poster maps to combine into one massive sci-fi installation!
This double-sided poster measures 22 by 34 inches, and is printed on glossy poster stock. It's pre-folded to 8.5 by 5.5 inches and packaged within a clear resealable envelope for safe and easy transport.
Includes a free 5 by 7 inch terrain card that can be placed over the Garrison Deck to retract the bridge docking to the armored transport vehicle from the north side!