Smart Poly™ material has been designed for the classroom and home. The material is strong, durable, water resistant, and does not need lamination. 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. Mat measures 12" x 17". The U.S. Education Set includes 4 learning mats: U.S. Map Basic (95000), U.S. Map Physical (95001), U.S. Presidents/First Ladies (95016) and U.S. Currency (95027).