11" x 16" Student Response Boards. Non-porous surfaces. Front side is lined and the back is a blank white dry erase surface. DRY ERASE BOARDS Factory Direct from THE MARKERBOARD PEOPLE. This features our "goof-proof" dry erase surface with the circulatory system permanently etched and locked onto the surface. All edges and corners are rounded for safety and durability. The board itself is a solid, wood board 1/8" thick.