Magnetic pieces will adhere to these Magnetic Plastic Framed Whiteboards. Dry erase markers wipe cleanly from the surface. Plastic frame is ribbed for easy grasping and has rounded corners for safety. Large 9-1/2" x 13" (24 x 33cm) size is great for individual or small group use. Set of 4 in red, yellow, green and blue. These boards do double-duty allowing magnets to stick to the board for patterning and other activities and whiteboard feature allows students to write with dry erase pens to save paper. These lapboards are perfect for an on-the-go travel activity or for use when desks or tabletops aren't accessible.