Unframed, dry-erase board offers a blue XY axis grid on one side & plain dry-erase surface on the other. Bold lines separate board into quadrants each 14 squares by 10 squares. The total grid is 28 squares by 20 squares. Individual squares measure 3/8" x 3/8". High-quality, dry-erase coating will not ghost. Board features rounded corners & smooth edges for comfort & safety. Durable hardboard backing is warp-resistant & chip-resistant.