liquid chalks Markers Reversible Tip THE BEST QUALITY . The best brilliant chalk ink and nibs from Japan. Quality control. ISO 9001. REVERSIBLE  bullet and round tip reversible ,100% Water Based FREE bonus  extra 5 tips and 8 black stickers For Use On: Chalkboard Decals, Windows, Plastic, Metal, Ceramics, Glass, Whiteboards and other Non-Porous Surfaces Easy to clean Up  you can easily clean them off with a damp cloth