These uni prockey permanent markers are a great marking option as you can use them on almost any surface. The odourless, water-based ink will not bleed through thin or porous paper so they can be used in a number of environments. These markers have a 5.7 Mm chisel nib so that you can write in a variety of line thicknesses. It is a great option to always have handy as it can write on almost any surface. The water-based ink is both odourless and permanent. This marker has an easy to hold round barrel. The ink will not bleed through thin or porous paper. This pack features an assortment of colours, including black, blue, red, green, orange, yellow and violet. There are 8 markers in this pack.