From their announcement:
Printed in full color on heavy cardstock this set is a quick and easy way to add roads to your game table. The sets are available in 3mm, 6mm, and 10-15mm. 20-25mm is coming soon. Each set comes with enough straight sections, curves, and intersections for a large table.
(NOTE: On some monitors the roads will have a pinkish tint. This is just my poor photography :) In real life the roads are a nice brown!