From the Website: Customize your ship for the mission at hand... This set of 12 double-sided terrain cards (plus two extras on the back of the two cover cards) provides everything you need to build your own cargo freighter, courier ship, or passenger liner. Mix and match the tiles to create countless variations, and rearrange them as needed to change the configuration of your own personal spacefaring vessel! With two sets you can double the size of your deck plan, or display two completely different vehicles at the same time... Each card measures 5 by 8 inches, and is printed on thick glossy cover stock. The complete set is gathered in a clear resealable envelope for safe and easy transportation. From the cover cards: 12 Double-Sided Terrain Cards Set includes: Twelve 5x8-inch double-sided map cards. Bonus Shuttle Bay and Cargo Pod tiles printed on the back of the cover cards.