Unframed, dry-erase board offers a blue XY axis grid on one side and 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 and smooth edges for comfort and safety. Durable hardboard backing is warp-resistant and chip-resistant.