These 1/2" graph dry erase board replace worksheets for math and graphing practice. Bold lines separate each board into quadrants, each 10 squares by 10 squares, offering a total grid that is 20 squares by 20 squares. Individual squares measure 1/2" x 1/2", and the plain work space is 11" x 5.25". Each board features a non-ghosting dry erase surface with rounded corners and smooth edges for safety and comfort. The durable hardboard backing is warp and chip resistant. Details:11" x 16" x 0.125"12 count