Academic Activity Place Mats are designed to stimulate creative interest with colorful activities. Laminated with write on/wipe off, 10 mil laminate that makes this activity mat durable and long lasting. Works with any dry erase markers. Sealed edges and rounded corners. Mats measure 12" x 17-1/2" . Each set includes 4 mats and magnetic dry erase marker. Topics include Addition Tables, Subtraction Tables, Multiplication Tables, and Division Tables.