Use fine point Bistro Chalk Markers on chalkboards, light boards, windows, windshields, and most non-porous surfaces. A wonderful way to create chalkboard art to attract attention and increase sales. They are opaque, water based, pigmented, erasable with a damp cloth. Each pack includes 4 markers: white, red, blue and green. Sold as 2 packs for a total of 8 markers.