Create your best chalkboard masterpieces yet with Uni Liquid Chalk Pens! This colourful four-pack gives you an easy and professional alternative to chalk that producing dense, vibrant lines. Draw and write onto chalkboards, windows, metals, plastics and other non-porous surfaces.These chalk pens are ideal for outdoor signs and boards. It is rain resistant but can easily wiped away using a damp cloth or mild detergent. Please note: the liquid chalk may be difficult to remove on textured or non-porous surfaces.Medium line (approx. 1.8mm-2.5 mm)Set of four pensBullet tipPerfect for designing colourful chalkboards!Uni Liquid Chalk Pens 1.8mm 4 Pack