Mats have base ten blocks (hundreds, tens, ones) pictured on one side. On the reverse is a grid with labels “hundreds,” “tens” and “ones”. Each side has space for students to write in numbers. Mats measure 9 x 12 inches each and are made of tough, flexible plastic for use with dry-erase markers. Ideal for grades 1 to 6. Set of 10 mats Write-On Wipe-Off Surface Perfect for practicing base ten concepts. Reusable