From Paizo website:
Dragons are among the most fearsome foes in fantasy gaming, and GameMastery Flip-Mat: Dragon’s Lair depicts the perfect location for the legendary conflict between hero and wyrm! Slay a powerful dragon in its own lair with this miniatures-scale map designed to enhance the visual appeal and ease of an important RPG battle in a desolate cavern lair.
GameMastery Flip-Mats are designed to make your game portable and affordable. They're made with durable, laminated card stock and can handle dry erase, wet erase, and even permanent marker!
Flip-Mats are constructed of durable laminated card stock (~70 lb paper -comparable to that of a restaurant menu). They measure 24" by 30", and quickly and conveniently fold down to 8" by 10" (slightly smaller than a sheet of notebook paper). The 1" grid extends fully to the edge of the maps for a full 720 square inches of usable area.