The pins do not stink.
The colors are strong enough to write with every read.
The colors are different enough to be easily tell them apart.
The caps close with positive click.
So far I have no pen has dried out after a few months.
The case closes with a positive action and the flap to open can be folded as a prop to offer Griffbereit around the pins.
The case is made of sturdy plastic and with recess for the terminal to the cap, so that it looks very neat.
Writing and drawings can be easily removed and it lubricates nothing.
