Smart Poly® Learning Mat 12"x17", Double-Sided, Solar System. Learn planets in orbit around the sun, galaxies, black holes and constellations in our night sky. Detailed information about each planet/ system on the back. Heavy duty double-sided surface for fun and colorful learning on both sides. Write-on/ wipe-off surface. Use with dry erase or water based markers and washable crayons. Each side is an interactive lesson.