Pentel N50 permanent marker pen with a bullet tip. Known as the UK's favourite permanent marker, it features a robust aluminium barrel and a bonded fibre tip that retains its shape. This marker writes on almost any surface, including cardboard, metal, wood, rubber, plastic, and glass, with an approximate line width of 2.0mm. Unlike most alcohol-based markers, the N50 contains heavy-duty solvent-based ink, making it ideal for serious industrial use. It can write on wet or greasy surfaces where other markers fail, drying instantly and permanently. The ink is waterproof and long-lasting.