Ironlak Pump Action Chalk Markers are water based chalk markers that allow artists controlled output, across a range of techniques, for temporary application on a variety of smooth surfaces including: glass, mirrors, dry-erase boards, plastic and metal. Available in two sizes – the 7mm chisel nib is great for filling medium areas, calligraphy or crisp, bold line work and the broad 15mm nib is great for filling large areas or crisp, bold line work. Its dense fibres retain more paint, to produce a continuous paint flow. A heavy pigment load provides fantastic coverage and strong, vibrant colours. The paint can easily be removed by wiping with either a wet or dry cloth. Not recommended for use on rough concrete and other porous surfaces. The non-toxic water based acrylic paint is suitable for everyone from children to professional artists.