This classroom set includes 12 durable masonite lap boards that are dual sided, plain white and lined. This pack also includes are a box of 12 pocket style dry erase markers with bullet tips in black and a 12 pack of 2" multi-purpose erasers. Dry erase boards are an environment friendly way to learn, as you just write, wipe off and re-use with no waste. Details:9" x 12" board size12 sets (lap board, marker, eraser)AP certified