The uni Chalk Markers PWE-5M water-based marker range gives vibrant colours that are perfect for eye-catching designs that hog the limelight without fading in it. Ideal for non porous Chalk Boards and glass in pubs or restaurants both inside and outdoors. They are rain resistant and produce dense vibrant colour designs with great effect. The ink can be easily removed from non porous surfaces using a damp cloth or mild detergent.