It's a poster, it's a placemat, it's both! 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 surface for fun and colorful learnings. Write-on/wipe-off surface for use with dry erase or water based markers and washable crayons. Use on table or hang on wall. Measures 9-1/2" x 13".