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