Dual sided, pre-printed lines on one side and blank on the other offers endless uses. Blank side works great for classroom games, math lessons and reminders. While our pre-printed side is great for penmanship and sentence writing. Durable masonite lap boards are 9" x 12" and can be used with all dry erase markers. An environment friendly way to learn, as you just write, wipe off and re-use with no waste. Length: 0.13. Width: 12. Height: 9