These Kassa Liquid Chalkboard Markers come in a pack of two white markers. They are the perfect marker for glass, mirrors, chalkboards and other non-porous surfaces. They erase easily and are non-toxic, so are great for kids too. Each marker has a reversible dual tip, a 4mm bullet tip and a 6mm chiseled tip. Writes like a dream, and the white is as vibrant as can be.