4-Pack White Liquid Chalk Markers for Blackboards Chalkboard Signs, Glass, Windows, With Eraser & Magnet on top. THE BEST CHALK MARKERS! 4-Pack Brand New Fine Tip White Liquid Chalk Markers. INK: Quick-drying ink guaranteed to leave no ghost shadows on any bona fide dry erase, glass, or most non-porous surfaces. ERASER: The cap of each marker is mounted with an eraser for convenient erasing function when needed while writing. MAGNETIC: The cap is also mounted with a magnet, which can easily hang the marker onto the surface of magnetic Black board, or on any metal surface such as refrigerator, file cabinet, etc. providing convenience to store or locate the marker. Compactly sized (4.5" in length) to work conveniently with various Black Boards and other surfaces.