• Medium-tip chalk markers for glass, dark boards, and other non-porous surfaces. • The chalk wipes off with a damp cloth. • The package contains 10 neon yellow chalk markers. • Opaque liquid chalk in a marker; water-based, odorless, and light-resistant. • Ideal for dust-free drawing. • For creative drawings at home on windows and mirrors. • Professional quality, clean designs on shop windows and menus of restaurants, bars, and hotels.