Use Bistro Chalk Markers on chalkboards, light boards, windows, windshields, and most non-porous surfaces. A wonderful way to create chalkboard art. They are opaque, water based, pigmented, erasable with a damp cloth. The color will remain until you decide to wipe it. Fully season any chalkboard surface before using to ensure the best results. The colors included in this set are Fluorescent Pink, Fluorescent Blue, Fluorescent Green, and Fluorescent Yellow.Details:Includes assorted colorsChisel tip6 packs (4 markers per pack, 24 total markers)PigmentedErasable with a damp clothAP CertifiedConforms to ASTM D 4236