This handy lap board features a blank Sudoku grid on the front, so you can fill in the given clues and your puzzle solution using the included black dry-erase marker. Lap board is made from lightweight, non-magnetic wood composite. Board is approximately 9″ x 12″ x 0.25″ thick. Includes low-profile metal pen clip and black dry-erase white board marker with pocket clip on pen cap. Back of lap board features blank dry-erase whiteboard surface.