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 Assorted Math Set includes 5 learning mats: Multiplication (95006), Division (95007), Addition (95008), Subtraction (95009) and Fractions (95010). Tables 1-12 on all except for fractions.