Magnetic Dry Erase Whiteboard/Chalk Board Duster/Eraser - Pack of 6 Size: 4.2 x 2.1 x 0.8 inch Suitable for dry-erase whiteboard, chalk board, glass or other surfaces Pack of 6, in assorted color, cheaper in bulk Strong magnet under pad, adheres to any magnetic whiteboard Ideal for home, school, office, hospital and factory