STABILO Pen 68 dark red pack of 10 - Premium felt-tip pen Benefit from the colour-intensive premium felt tip pen for strong lines and large areas. The STABILO Pen 68 is well known for its high brilliance and luminosity. Its robust medium tip has a line width of 1 mm. You are able to leave the cap off until 24 hours and the pen won't dry out. The colour-intensive premium fibre pen has a water-based ink.