Inside the chunky aluminium barrel of each Pentel N50 permanent marker is quality Pentel indelible ink that writes smoothly on almost any surface from plastic and metal to ceramics and glass. The bullet tip writes a 1.5 to 2.0mm line width which is ideal for general purpose use in industry or commerce. This pack contains 12 black markers.Durable permanent markerBonded fibre tips retain their shapeHeavy duty with tough aluminium barrelBullet tip 4.3mm tip gives approximately a 2.2mm line widthBarrel colour matches ink colourInk colour: BlackPack of 12Will write on almost any surface including cardboard plastic metal wood and glassNew fine point and extra broad tipVivid waterproof ink