Use Bistro Chalk Markers on chalkboards, light boards, windows and windshields. A wonderful way to create chalkboard art to attract attention and increase sales. They are opaque, water based, pigmented, erasable with a damp cloth. The markers are all made from the highest quality ingredients with customer satisfaction as the prime goal. These state of the art markers are also light-fast, meaning they do not deteriorate when exposed to sunlight and they retain the most vibrant colors compared to all other chalk markers in the market! Each pack contains 4 chalk markers. Sold as 2 packs for a total of 8 chalk markers.