Vibrant And Bold Modern Upgrade To Classic Writing Chalk. Suitable For Use On All Non-porous Surfaces Such As Synthetic Chalk Boards, Glass, Plastic, Metal Or Laquered Wood. Writing/Art Work Is Resistant To Smudging And Fade Proof (Once Dry). Simply Wipe Clean With Wet Soapy Cloth Or Cleaner (SECCLEAN-GR) To Reuse Surface.