Liquid chalk ink, dust-free Dry erase markers Perfect for glass boards Ideal for chalkboards - easy to erase with a damp cloth High-quality chalk markers ideal for various types of boards. The ink used in the ALLboard markers is dust-free, so even children can use them safely. The chemical formula of the liquid ink makes it stick well to smooth surfaces such as whiteboards, chalkboards or glassboards. ALLboards chalk markers are also available in other colours. Shake well before use to mix ink. To start writing, press the tip to the surface in a vertical position few times to allow the tip of the marker to fill with ink. Press and secure cap well after use.