Use 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 with a chisel tip: fluorescent pink, fluorescent blue, fluorescent green, and fluorescent yellow. Sold as 2 packs for a total of 8 markers.