Alvin Penstix Technical Markers
Alvin Penstix are drawing markers with India ink style ink that takes forever to dry but looks good when finished. Easy to smudge but good for detailed drawing where solid, black lines are required.
This pens are somewhat interesting because the "pocket clip" is on the opposite side of the pen from the removable cap!
Alvin Penstix Technical Pens - 3-pack with the .3mm, .5mm, and .7mm Alvin Technical drawing pens.