Tried and trusted chisel tip permanent marker Robust aluminium barrel Bonded fibre tip retains its shape Will write on almost any surface including cardboard, metal, wood, plastic and glass 5.7mm to 3.9mm tip gives a variable line width Pack of 4 contains 2 black and 1 each of blue and red ink Find out more about PenTools Click here to find out more about our N50 range Marker Usage Guide