ChalkArt 4 White Liquid Chalk Markers, 4.5mm Reversible Tip - ONLY SUITABLE FOR NON POROUS SURFACES IMPORTANT TIPS -- ChalkArt be designed to be used on NON-POROUS surfaces. Not to use on porous surface. Before using always test on a small section of the surface. REVERSIBLE TIP -- bullet/chisel, easy to do both fine and bold work. With 8gms of ink, Water based, Non-toxic. Create fantastic, eye-catching, attention grabbing displays! A wonderful way to create art to attract attention and increase sales. VERSATILE -- These markers are completely versatile. They can write on any NON-POROUS surface, Window, Mirror, glass, plastic, non-porous chalkboard and even metal. The only limit is your creativity! DUST FREE -- The Liquid chalk is completely dust free. Simply wipe with a damp cloth and watch as it disappears without the regular smudge and mess! Concentrated liquid prevents running and dripping. GUARANTEE -- Protected by a free 90-day money back guarantee. PACKAGE -- bright color liquid chalk marker (4.5mm reversible Tip) (4 Pack). chalkboards glass slate vinyl plastic metal