Bistro Chalk Markers are the perfect every day chalk marker. These chalk markers work on chalkboards, dry erase boards, light boards, windows, windshields, and other non-porous surfaces so you can write or create art virtually anywhere. These markers come in 19 colors and are opaque, water-based, and pigmented. Clean up is super easy, they are erasable with a damp cloth. Each pack includes 3 markers in 3 sizes: 3 mm fine, 6 mm broad, and chisel.