The best drawing pen ever

Is not marketed as a drawing pen at all!
 

Pros:

• A felt-tip style point. Very controllable.
• Doesn't bleed. At all.
• It's not like most CD markers, which are just like narrow permanent markers. I think this must be a pigment marker.
• Really black and opaque.
• Doesn't fade
• Waterproof
• Is not expensive.
• Most important - writes over tippex without smudging - doesn't even get paler if you use a rubber to get rid of pencil lines.

Cons:

• If you allow it to get warm (say, by lying in the sun, or on a switched on light box) it will dry up permanently.
• Ditto if you leave the lid off, even for a tiny length of time.
• There are only two thicknesses: 0.75mm and 1mm - and it's the narrowest millimetre I've ever measured.