The edding e21 EcoLine Permanent marker has a round nib with a stroke width of 1.5-3mm and is perfectly suited for marking and labelling almost all materials, e.g. paper, cardboard, metal, plastic and glass. The ink is quick-drying, waterproof and wear-resistant on almost all surfaces using a low-odour ink with no added toluene/xylene. The box includes pack of 4 with the colours Black, Red, Blue and Green.