From the publisher's website:
GameMastery Map Pack: Ship’s Cabin contains 18 full-color 5 x 8-inch map tiles, stunningly crafted by cartographer Jason Engle, that combine to form a variety of seaworthy locales fit for both pirates and privateers! These tiles also link up with Flip Mat: Pirate Ship.
For use with all tabletop roleplaying and miniatures games and suitable for experienced GMs and novices alike, this product fits perfectly into any Game Master’s arsenal.
Wet, dry, and permanent markers erase from the tiles!