FeaturesTried and trusted best-selling permanent markerBonded fibre tip retains its shapeWill write on almost any surface including cardboard, metal, wood, plastic and glass3.18mm bullet tip gives an approx. line width of 1.0mm – ideal for fine detailingPack of 12 black inkPentel N50S bullet tip permanent marker. 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 1.0mm. Unlike most markers, which are alcohol-based, the Pentel Fine Tip Permanent Marker (Box of 12) 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.