Smart Poly™ material has been designed for the classroom and home. The material is strong, durable, water resistant, and does not need lamination. Practice making change, and learn about coins on the front and dollars 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. Mat measures 12" x 17" .