Twice as thick as the usual dry erase board, this heavy duty, economical, unframed lap board with a plain dry erase surface is ideal for doodling, math or handwriting practice, and more!Quality write-and-wipe surface is non-ghosting. Hardboard backing is warp and chip resistant. Radius corners and smooth edges for comfort and safety.Board measures 9" x 12" x 0.25".Each bar measures 2" x 20" x 0.1875". Set of 12