Pentel N50 Marker. Durable permanent bullet tip marker, suitable for almost any surface rough or smooth. Heavy duty, with a tough aluminium barrel. The UK's favourite permanent marker. Robust aluminium barrel. Bonded fibre tip retains its shape. Will write on almost any surface, including cardboard, metal, wood, rubber, plastic and glass. Approx line width 2.0mm. Unlike most markers, which are alcohol-based, the N50 contains heavy-duty solvent-based ink, ideal for serious industrial use. Will write on wet or greasy surfaces where other markers fail, drying instantly and permanently.