From the company website:
Gaming Paper is the latest innovation in roleplaying and miniatures accessories and is a low-cost alternative to expensive battlemaps and tile sets. It’s an inexpensive, reusable and disposable product for gamers.
Gaming Paper is sold in convenient rolls that are 30 inches wide and 12’ long, for 30 square feet of playing surface. At only $4/roll, it is a fraction of the cost of other gaming mats on the market. Not only is it usable for miniatures games, but it is also ideal for roleplaying games. Anyone can use pens, markers, or other simple writing implements to create detailed terrain for campaigns or miniatures battles.