Gridded dry erase board is terrific for bar charts, line graphs, pictographs and more. 9x12" board features a 1/2" blue grid with 15 rows and 20 columns. Every 5th row and column is marked with a bolder line to help keep information organized while students are learning to graph. Double-sided board is plain white on the reverse, making it great for a variety of uses. Board is warp- and chip-resistant, plus has rounded corners for safety.