TrendBox-1 Set of 8 Colors Motorcycle Car Outdoor Permanent Truck Tire Thread Metal Paint Ink Fibre Nib Marker Pen For Drawing Writing Best used on all hard non porous surfaces, glass, whiteboards, mirrors, plastics, etc. Make teaching Materials more fun with colors, fun and educational supply tool. The liquid chalk is completely dust free. The drawings are easy to clean up (No dust) and WILL wipe away easily. These chalk markers is perfect for Asthma and Allergy Suffers and safe to use near electronics. Perfect for use at home or in the office.